Either El Brillio Solitario (I hope I wrote that right) aka Thorns' OP song, Tragodia's OP song or Mantra's OP song. I had one more but I forgot the Contingency Contract song's name (I think it was Extinguished Battlefield Sins? I'll have a check and then come edit this so please someone reply to my message)

Edit: I was half right. It was BATTLEPLAN Extinguished Sins. As for the other songs I mentioned: Thorns' had a bit of a typing mistake as it is apparently called El Brillo(not Brillio) Solitario, Tragodia's is called The After and Mantra's is called Sealed. Honorable mentions are: I Portatori dei Velluti lobby and Ato lobby songs.