A musical motif representing the droid revolutionary L3-37 was composed by John Powell for the 2018 film Solo: A Star Wars Story. The jaunty march is prominently featured in the soundtrack's "Mine Mission" track, which plays in the film when L3-37 liberates the enslaved people, including droids, of the spice mines of Kessel.
External links
John Powell - Mine Mission (From "Solo: A Star Wars Story"/Audio Only) on the official Disney Music VEVO YouTube channel (backup link)