Well, the track in my iTunes that's gotten the most "plays" is the finale to Furtwängler's symphony no.2 (Barenboim/Chicago Symphony)... the answer to "right now" is, I think, the finale of Mozart's 6th string quintet, running about in my head, but the answer probabilistically most likely seems to be the Furtwängler

(followed by the rest of the work, followed by some Medtner recordings, Bax, and at least the first movement of Boughton's lovely Symphony no.2 "Deirdre"...)