Abstract: The present invention relates to a method and apparatus to synchronise audio and video data. More particularly, the present invention relates to a loop-based audio-visual mixing apparatus and method for synchronising a plurality of videos and their corresponding audio streams to create audio-visual compositions. According to one aspect, there is provided a method for creating a synchronised lineal sequence from multiple inputs of audio and video data, comprising the steps of: providing a first input, comprising audio and video data; providing one or more subsequent inputs, comprising audio and video data; determining at least one rhythm metric unit for each input; queueing the or each subsequent inputs such that the or each subsequent input is triggered at a beginning of a next said rhythm metric unit of a determined input.