I think I know what the opening song is.
A crowd pleaser - so most likely in DT Division 1
Never played as an opener before
Played recently - so it's been played by Mangini BUT
A monster track - that needs to be transcribed by Mangini, so it is difficult to play on the drums
Bosk1 listens to Windows Media Player, which arranges albums based on alphabetical order
DT and Epica both have an album named Score
Epica's Score comes in 25 minutes after bosk1 listens to the song
The last song in DT's Score audio CD is Octavarium. But it's not played in recent years.
So it's not DT's Score audio CD. It's an audio rip of DT's Score DVD
What song comes in in the last 25 minutes of DT's Score DVD?
THE GREAT DEBATE
Which is why bosk hinted he is listening to it right now. It also means he's listening to the DTF faithful having a great debate on what the opening song is.