Great idea but IMO there are songs that would fit perfectly the whole thing you left out. First of all there's a handful of tracks I think are mandatory in this format:
- Phantom Of The Opera (... do I need to say anything?)
- Hallowed Be Thy Name (it has orchestra written all over)
- The Trooper (already done by cover bands and with great results)
- Revelations (once again... do I need to say anything?)
- To Tame A Land (another one with orchestra written all over)
- Rime Of The Ancient Mariner (this is THE SONG that simply must have an orchestral version )
- Powerslave (also a no brainer)
- Wasted Years (another of the few short songs I think would sound stellar with an orchestral arrangement)
- Alexander The Great (yup.... no doubts here)
- Seventh Son (after ROTAM I think this is the track that would sound better in this format)
- Fear Of The Dark (already done by Blaze and Doro and sounded quite great)
- Sign Of The Cross (besides ROTAM and SSOASS this is my imediate pick)
- For The Greater Good Of God (that chorus with an orchestra....)
- The Book Of Souls (another perfect fit)
Plus:
Prodigal Son (it begs to be played with an orchestra)
Infinite Dreams (fits exactly the profile)
Blood Brothers, Dance Of Death and Paschendale (although not being my top tier sonhgs the orchestral versions featured in the No More Lies EP are mind blowing!)
P.S: I didn't put EOTC because the track itself is already filled with orchestral arrangements.