"The closing music, which was largely transcribed from a Bulgarian folksong", according to Gary Carpenter, is played by the London Symphony Orchestra. Labelled as Sunset on the soundtrack album, it is a Bulgarian folk tune entitled Zamrakanala Mona Jana. The principle trumpet holding out that long note was Maurice Murphy (GC)
The Silva Screen version lists it as being played by The City of Prague Philharmonic Orchestra, Gary Carpenter, arranger.
It is the same in all movie versions and audio recordings.