Two violins and orchestra, if you count the slow movement- one can either treat that as one does the concertante string solos in the Tchaikovsky 2nd piano concerto I'd say (which is after all never described as a concerto for piano trio and orchestra, after all, nor is the Brahms 2nd called a concerto for piano, cello and orchestra -though the 2nd solo's contribution here seems more substantial in size... ) or else the invitation of "Konzert im alten Stil" as a concerto for orchestra/concerto grosso?? with slightly variable orchestration :) Eric 01:12, 15 November 2009 (UTC)