Content Mixing

1 . A computing device comprising:

at least one processor;

at least one non-transitory computer-readable medium; and

program instructions stored on the at least one non-transitory computer-readable medium that are executable by the at least one processor such that the computing device is configured to:

receive an indication of a voice command;

determine, based on the voice command, (i) first audio content that comprises a response to the voice command and (ii) a duration of the first audio content;

identify a first playback device that is playing back second audio content in synchrony with a second playback device; and

transmit, to the first playback device, (i) a first message indicating the first audio content and the duration of the first audio content and (ii) a second message indicating instructions to (a) while playing back the second audio content in synchrony with the second playback device, simultaneously play back the first audio content, and (b) after the duration of the first audio content, continue playing back the second audio content in synchrony with the second playback device.

2 . The computing device of claim 1 , wherein the computing device comprises the second playback device.

3 . The computing device of claim 1 , wherein the second message further indicates instructions to (c) mix the first audio content with the second audio content.

4 . The computing device of claim 1 , further comprising program instructions stored on the at least one non-transitory computer-readable medium that are executable by the at least one processor such that the computing device is configured to:

transmit, to the second playback device, a third message indicating instructions to change a playback volume of the second playback device for playing back the second audio content while the first playback device is playing back the first audio content.

5 . The computing device of claim 4 , further comprising program instructions stored on the at least one non-transitory computer-readable medium that are executable by the at least one processor such that the computing device is configured to:

transmit, to the second playback device, a fourth message indicating instructions to, after the duration of the first audio content, revert the change to the playback volume of the second playback device for playing back the second audio content.

6 . The computing device of claim 4 , wherein the instructions to change the playback volume of the second playback device comprise instructions to reduce the playback volume of the second playback device.

7 . The computing device of claim 1 , wherein the instructions to (a) while playing back the second audio content in synchrony with the second playback device, simultaneously play back the first audio content comprise instructions to (a) while playing back the second audio content in synchrony with the second playback device at a second volume, simultaneously play back the first audio content at a first volume, wherein the first volume is higher than the second volume.

8 . The computing device of claim 7 , wherein the instructions to (b) after the duration of the first audio content, continue playing back the second audio content in synchrony with the second playback device comprise instructions to (b) after the duration of the first audio content, continue playing back the second audio content in synchrony with the second playback device at the second volume.

9 . The computing device of claim 1 , wherein the first playback device and the second playback device are bonded playback devices.

10 . A non-transitory computer-readable medium, wherein the non-transitory computer-readable medium is provisioned with program instructions that, when executed by at least one processor, cause a computing device to:

receive an indication of a voice command;

determine, based on the voice command, (i) first audio content that comprises a response to the voice command and (ii) a duration of the first audio content;

identify a first playback device that is playing back second audio content in synchrony with a second playback device; and

transmit, to the first playback device, (i) a first message indicating the first audio content and the duration of the first audio content and (ii) a second message indicating instructions to (a) while playing back the second audio content in synchrony with the second playback device, simultaneously play back the first audio content, and (b) after the duration of the first audio content, continue playing back the second audio content in synchrony with the second playback device.

11 . The non-transitory computer-readable medium of claim 10 , wherein the computing device comprises the second playback device.

12 . The non-transitory computer-readable medium of claim 10 , wherein the second message further indicates instructions to (c) mix the first audio content with the second audio content.

13 . The non-transitory computer-readable medium of claim 10 , wherein the non-transitory computer-readable medium is also provisioned with program instructions that, when executed by at least one processor, cause the computing device to:

transmit, to the second playback device, a third message indicating instructions to change a playback volume of the second playback device for playing back the second audio content while the first playback device is playing back the first audio content.

14 . The non-transitory computer-readable medium of claim 13 , wherein the non-transitory computer-readable medium is also provisioned with program instructions that, when executed by at least one processor, cause the computing device to:

transmit, to the second playback device, a fourth message indicating instructions to, after the duration of the first audio content, revert the change to the playback volume of the second playback device for playing back the second audio content.

15 . The non-transitory computer-readable medium of claim 13 , wherein the instructions to change the playback volume of the second playback device comprise instructions to reduce the playback volume of the second playback device.

16 . The non-transitory computer-readable medium of claim 10 , wherein the instructions to (a) while playing back the second audio content in synchrony with the second playback device, simultaneously play back the first audio content comprise instructions to (a) while playing back the second audio content in synchrony with the second playback device at a second volume, simultaneously play back the first audio content at a first volume, wherein the first volume is higher than the second volume.

17 . The non-transitory computer-readable medium of claim 16 , wherein the instructions to (b) after the duration of the first audio content, continue playing back the second audio content in synchrony with the second playback device comprise instructions to (b) after the duration of the first audio content, continue playing back the second audio content in synchrony with the second playback device at the second volume.

18 . A method implemented by a computing device, the method comprising:

receiving an indication of a voice command;

determining, based on the voice command, (i) first audio content that comprises a response to the voice command and (ii) a duration of the first audio content;

identifying a first playback device that is playing back second audio content in synchrony with a second playback device; and

transmitting, to the first playback device, (i) a first message indicating the first audio content and the duration of the first audio content and (ii) a second message indicating instructions to (a) while playing back the second audio content in synchrony with the second playback device, simultaneously play back the first audio content, and (b) after the duration of the first audio content, continue playing back the second audio content in synchrony with the second playback device.

19 . The method of claim 18 , wherein the second message further indicates instructions to (c) mix the first audio content with the second audio content.

20 . The method of claim 18 , further comprising:

transmitting, to the second playback device, a third message indicating instructions to change a playback volume of the second playback device for playing back the second audio content while the first playback device is playing back the first audio content.