Provide more info, please.
The song opens with a lead instrument which is a sample of guitar amplifier feedback. I believe it is the melody from a Brahms ‘slavic dance.’ Later, the lead is Famisynth 2.5 (if memory serves; i’m not on the music computer at the moment). The guitar feedback samples have some ‘attack clicks’ which i wasn’t quite able to get rid of.
The bass line is Medusa2. It combines a couple of reconstructed-from-memory riffs from Rachmaninov’s piano concertos #2 and #3.
The guitar solo is an improvisation, played back at 2x (C-5).
The last part is: i, iv, V, i.
At any rate, this is a lot of fun; learning how to employ Renoise 2.5!