El Topo and Precursor join the soundtrack
El Topo is an early alias of Travesty, from around 15 to 17 years ago, and was one of Phil May's projects running in parallel with Precursor. Tracks under this alias are by Phil May, and none of them are drum and bass. The El Topo tracks in the game are Alacrity (tagged 2009) and Grubstep.
Precursor is an alias of Travesty that pre-dates the name Travesty, from around 15 years ago. It and El Topo were both Phil May's projects, running in parallel. The tracks are labelled "Precursor"; the SoundCloud page may call it "The Precursor". Dates and details are in the bio and descriptions on SoundCloud. The Precursor tracks in the game are Spook, Stretchy, Spindle 2, Motion Sickness.