This is the Tchaikovsky Symphony No. 6 viola excerpt from Mvt. 1, (Allegro non troppo until 6m after Reh. C)
Recordings:
Herbert von Karajan: Berliner Philharmoniker, 2007
Quarter Note = 112-114
Leonard Bernstein: New York Philharmonic, 2011
Quarter Note = 104 (at first) 116-118 after Reh B
Evgeny Mravinsky: Leningrad Philharmonic Orchestra, 1987
Quarter Note = 102 (at first), 116 after Reh B
Midi Practice Tracks:
*These were created using MIDI with the viola part removed. I intensely dislike the midi orchestral instrument sounds, so I changed many of the instruments to the piano patch. Playing along with them provides the rhythmic stability of using a metronome while adding the framework for what else is happening in the orchestra.
Quarter Note = 80
Quarter Note = 90
Quarter Note = 100
Quarter Note = 114
Video from YouTube:
Herbert von Karajan: Wiener Philharmoniker
Excerpt starts at 2:25
Vladimir Fedoseyev: Moskow Radio Symphony Orchestra, 1991
Excerpt starts at 2:50