It's an exciting work achieved by stanford university trying to realize music style transfer based on CNN-related method. Their introduction paper could be found in https://arxiv.org/abs/1801.01589. And what makes it important is that it should be treated as one of the best introduction reproduction project for music transfer area. Their code could be found in https://github.com/alishdipani/Neural-Style-Transfer-Audio.

Neural Style Transfer for Audio Spectograms

As it was already mentioned, timbre style transfer is used for the sound representation. "It means to alter the timbre information in a meaningful way while preserving the hidden content of performance control." 

San Diego State University

1. Timbre Style Transfer (sound)
2. Performance Style Transfer (control)
3. Composition Style Transfer (score)

Music Style Transfer For Different Music Representations

https://arxiv.org/pdf/1803.06841.pdf?fbclid=IwAR2Q2RfvxXAG_G1475NUA9qBssBDSOECQl3-ICohC8gT1dT6j3nz0Q48_7Y

Music Style Transfer: A Position Paper

Timbre Style Transfer

"Performance style transfer applies to performance control representation. It means to alter the control information in a meaningful way while preserving the implicit score content." Performance focuses on the way the players play the scores or sheet music. 

Performance Style Transfer

"Composition style transfer means to preserve the identifiable melody contour (and the underlying structural functions of harmony) while altering some other score features in a meaningful way."

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