Tchaikovsky - Piano Concerto In B Flat Minor, Allegro Non Troppo
Please note this isn't me "showing off" my taste in classical music, rather it's the first mp3 in my study playlist, a few months ago I decided to do an online course and I quickly found decades old study habits coming back, such as listening to calming music while trying to wrap my brain around an obnoxious subject.
As much as I love my hard rock, it's not conducive to study.