They should do The Wall (The Entire Album). Al I can Imagine is grandiose orchestral elements, Soaring synth arpeggios and other electronic elements, kick-ass Kaoss Pad Solos and vocal harmonies between Dom and Chris
...and Dom
Lol! I failed!
But I meant something more elaborate, with prominent strings and some guitar arrangements, don't count Exogenesis since it's not a classical song, but it's actually better or as good as any classical song
Queen - Bohemian Rhapsody (Or any other song by them)
Depeche Mode - Enjoy the Silence
Keane - Everybody's Chaniging
Radiohead - Paranoid Android (Or No Surprises)
The Beatles - Let it Be
Any of them
By the way, this is my first post