18. A non-transitory computer readable medium comprising executable code that, when executed by a processor, causes a server computing system comprising one or more computing devices to perform a process comprising: retrieving a first content item from a first content source and a second content item from a second content source, wherein the first content source is different from the second content source; identifying first text-to-speech voice data based at least partly on an association between the first text-to-speech voice data and a characteristic of the first content item; generating a first audio presentation of the first content item utilizing the first text-to-speech voice data; identifying second text-to-speech voice data based at least partly on an association between the second text-to-speech voice data and a characteristic of the second content item; generating a second audio presentation of the second content item utilizing second text-to-speech voice data; and assembling an audio program comprising the first audio presentation and the second audio presentation.
22. The non-transitory computer readable medium of claim 18 , further comprising: identifying second text-to-speech voice data and third text-to-speech voice data based at least in part on a characteristic of the second content item; in response to determining that the second text-to-speech voice data comprises the first text-to-speech voice data, generating the second audio presentation based at least in part on the third text-to-speech voice data; and in response to determining that the second text-to-speech voice data does not comprise the first text-to-speech voice data, generating the second audio presentation based at least in part on the second text-to-speech voice data.