17d. Composer, homeless, wandering around college. M*S*H*L*S. 18d. Flying bird is in something sung by those 5 and 26d (These are 'Brahms and Liszt'!). ***N***I. 21a. Strive to play proposed theme of Gershwin 1a (This is ' Rhapsody'). **V*T*. Invite comes to mind but not likely. 23d. Unusual restricting recording after piano's set up. P*E*A*E. Prelate or prebake make no sense. 27a. Approve backing hero in song sung by those 5 and 26d (Drunk again!). S*O***N.