This Sunday, Year 2 of the "Best of the Bluff" concert series returns to in-person concerts with the Sonata No. 4 for Cello and Piano by Beethoven; Schumann's Fantasy-pieces for Cello and Piano; and the Schubert Trout Quintet.  The concert takes place at PNC Recital Hall at 3pm.  Artistic Director David Allen Wehr spoke with WQED-FM's Anna Singer about the series, how the music was chosen; and more.