Orchestrated Rock...Uriah Heep and others

No recommendations, but just a comment on how rarely Uriah Heep gets mentioned around here!

Love’m!

I guess you mean the use of strings. As far as classic rock goes, Days of Future Passed by the Moody Blues is a great one, and in newer stuff, Beck often makes good use of strings on some songs. (Morning Phase) 

Just off the top of my well abused & old as dirt brain I recall:Pink Floyd,Led Zeppelin,The Scorpions,White Snake,UFO,ELO,EL&P,The Beatles,The Beach Boys,Deep Purple,Queen,Metallica,Alan Parsons Project,Supertramp,Kansas,Jethro Tull,Rush & Stevie Nicks all using full orchestras at one time or another...I'm sure just about EVERY decent rock band did this as well...

Procol Harum - 'Live in Concert with the Edmonton Symphony Orchestra'

Elton John - 'Live in Australia with the Melbourne Symphony Orchestra'

Electric Light Orchestra - 'Eldorado'

Metallica - 'S&M' 

4 that I can think of offhand.  Procol Harum was the earliest in 1972.  ELO was a year or two later.  

Rich

The moody blues ,if you define orchestration in detail that will define exactly your prospective.