Machines, systems, and methods are provided for receiving, from a plurality of users, a plurality of messages, each message comprising audio content and video content taken by each of the plurality of users. For each message of the plurality of messages, the machines, systems, and method determine whether audio fingerprints of the audio content of the message correspond to a designated gallery comprising video content constructed to comprise a sequence of videos from a plurality of users set to an audio time line, and based on determining that the audio fingerprints of the audio content message correspond to the designated gallery, determine an audio segment of the audio time line of the designated gallery to which the audio content of the message corresponds. The machines, systems, and methods add the video content from the message to the audio time line of the designated gallery at the audio segment to which the audio content of the message corresponds.