The following selections were found in iTunes for
Tommy Dorsey "Once in a while":

Title	Artist	Album	PURCHASE
Once In a While	Tommy Dorsey and His Orchestra	The Best of Tommy Dorsey (Remastered)
Once In a While	Tommy Dorsey and His Orchestra	Tommy Dorsey: Greatest Hits
Once In a While	Tommy Dorsey	The Seventeen Number Ones
Once In a While	Frank Sinatra & Tommy Dorsey	The Song Is You (Remastered)
Salute To Tommy Dorsey, Pt. 2: I'll Never Smile Again / Once In a While / Oh ! Look At Me Now / Boogie Woogie / On the Sunny Side of the Street	The Modernaires	So It Goes! - Singles of the '50s
1937 Medley - Once In a While / When My Dreamboat Comes Home	Tommy Dorsey and His Orchestra	Palladium Nov. 26, 1940 / Raleigh Jan. 6, 1943 (Live)
1937 Medley: Once In a While - When My Dreamboat Comes Home	Tommy Dorsey and His Orchestra	On the Radio
Once In A While	Members of the Tommy Dorsey Orchestra	The Big Band Era , Volume 10 - The Passing Of An Era
Once In A While	Tommy Dorsey Orchestra	100 Vocal & Jazz Classics - Vol. 7 (1937-1938)
Once In a While	The Pied Pipers	A Tribute too Tommy Dorsey
Once in a While	Tommy Dorsey	Dorsey & Miller
Once In A While	The Pied Pipers	A Tribute To Tommy Dorsey
Once In a While	The Tommy and Jimmy Dorsey Orchestra	Big Band Hits of Tommy and Jimmy Dorsey
Once in a While (Remastered)	Mills Brothers & Tommy Dorsey	Once in a While (Remastered) - Single