Swan Lake - there are few pieces I have more often had stuck in my head and been able to identify so infrequently. It is a sublime ballet, with the characteristically majestic and emotive rising Swan's Theme which one would expect from Tchaikovsky. The delicate oboe contrasting with the ponderous horn echo and the tutti strings... delicious.
I like the pace of the oboe solo, but the descending brass line later is far too fast:
Less passionate intro, but appropriate gravitas to the brass: