1. A system comprising: one or more processors; a computer-readable memory; and a module comprising computer executable instructions stored in the memory, wherein the one or more processors, when executing the module, are configured to: receive, from a client device, user selection data regarding a first content source and a second content source, wherein the first content source is different from the second content source; retrieve a first content item from the first content source and a second content item from the second content source; determine, based at least in part on an association between a characteristic of the first content item and a characteristic of first voice data, to use the first voice data to generate a first text-to-speech presentation of the first content item; determine, based at least in part on an association between a characteristic of the second content item and a characteristic of second voice data, to use the second voice data to generate a second text-to-speech presentation of the second content item; generate the first text-to-speech presentation of the first content item based at least in part on the first voice data; generate the second text-to-speech presentation of the second content item based at least in part on the second voice data; assemble an audio program comprising the first text-to-speech presentation and the second text-to-speech presentation; and transmit the audio program to the client device.
1. A system comprising: one or more processors; a computer-readable memory; and a module comprising computer executable instructions stored in the memory, wherein the one or more processors, when executing the module, are configured to: receive, from a client device, user selection data regarding a first content source and a second content source, wherein the first content source is different from the second content source; retrieve a first content item from the first content source and a second content item from the second content source; determine, based at least in part on an association between a characteristic of the first content item and a characteristic of first voice data, to use the first voice data to generate a first text-to-speech presentation of the first content item; determine, based at least in part on an association between a characteristic of the second content item and a characteristic of second voice data, to use the second voice data to generate a second text-to-speech presentation of the second content item; generate the first text-to-speech presentation of the first content item based at least in part on the first voice data; generate the second text-to-speech presentation of the second content item based at least in part on the second voice data; assemble an audio program comprising the first text-to-speech presentation and the second text-to-speech presentation; and transmit the audio program to the client device. 28. The system of claim 1 , wherein the one or more processors are further configured to determine the characteristic of the first content item by analyzing at least one of: textual content of the first content item, data regarding the first content source, or data regarding an author of the first content item.