Every major studio bandleader--Ben Selvin (Columbia), Nat Shilkret, Leonard Joy (both Victor), Louis Katzman (Brunswick), Bob Haring (Cameo, Brunswick, later ARC). "Carl Fenton" (Brunswick, also Gennett and QRS), and Paul Bolognese (Grey Gull, later recording for Gennett s "Paul's Novelty Orchestra")--had a "first call" list of musicians that he would call for recording dates.
Mike Mosiello is known to have been on the list for dates by Nat Shilkret and Leonard Joy at Victor, and for Paul Bolognese at Grey Gull. He is not usually associated with Ben Selvin's dates for Columbia. Neither is he associated with dates for such free-lance leaders as Sam Lanin or Fred Rich.
Things get even more freewheeling when one deals with saxophonists--especially alto saxophonists who double on clarinet, bass clarinet, baritone sax, and anything else that isn't nailed down.
Thus Benny Goodman was often called for dates at Columbia with Ben Selvin--while Jimmy Dorsey, his one-time room-mate, was often called by Victor Young for dates at ARC-Brunswick, sitting alongside the likes of Bennie Krueger.
Sometimes, when Selvin couldn't get Goodman, he'd go with Larry Abbott (who cold double comb), or Andy Sannella, or Arnold Brilhart (who could double oboe and flute as well).
The late Harry AVery recalled to me in a letter back in the 'Seventies that he auditioned a date that Selvin led at the Columbi studios, with the sides to be issued on the Harmony labels and on OKeh, under various and sundry pseudonyms Avery wsa surprised that the musicians there ran through each arrangement once, then cut it for recording. (This was the date where vocalist Paul Small mangles a lyric on "Wrap Your Troubles In Dreams'--yet it got issued anyway.)
This could be Mannie Klein. . .or Bob Effros. . . or any other trumpeter upon whom Ben Selvin would call with frequecy.