Methods, systems, and/or devices for overlaying and playing back audio data for user vocals and media content received from distinct devices and systems at a media presentation system are described herein. In one aspect, a media presentation system receives, from a remote server, a first data stream for a first media item, and plays the first media item. While playing the first media item, a second data stream for audio data that includes vocals is received from an application at a client device distinct from the remote server. The vocals are overlaid with the first media item to generate a composite data stream, which includes combining the first and second data streams, and the media presentation system plays the overlaid vocals.