System for mixing a video track with variable tempo music

A system for a user to view a video that is synchronized to a prerecorded variable tempo music, the system comprising:

• a processor and a memory on a non-transitory computer readable medium, the memory including
• a multi-track digital audio file of a preselected piece of music having a plurality of audio tracks that include an isolated instrument audio track containing only audio from the isolated instrument, and an emulation audio track consisting of the multi-track digital audio file having the isolated instrument audio track removed;
• and,
• a variable timing reference track designed and provided for a user for the preselected piece of music, wherein the preselected piece of music was prerecorded, and the designing of the variable timing reference track includes creating a tempo map having variable tempos, rhythms, and beats using notes from the preselected piece of music;
• a transformation module on a non-transitory computer readable storage medium and in operable communication with the processor for transforming the multi-track digital audio file to include a variable gain ratio of (i) the isolated instrument audio track to (ii) an emulation audio track, wherein the emulation audio track represents a subtraction of the isolated instrument audio track from the plurality of audio tracks, and the gain ratio is selected by the user;
• a emulation module on a non-transitory computer readable storage medium and in operable communication with the processor for emulating the isolated instrument audio track with a preselected musical instrument under a guidance of the variable timing reference track;
• and,
• a video display module on a non-transitory computer readable storage medium and in operable communication with the processor for viewing a digital video that is synchronized to the variations in the musical tempo using the variable timing reference track.