Photo 1: 
Publicity shot of Clark A. Yocum
Taken at Paramount Studios in 1941 in conjunction with filming of "Las Vegas Nights" with Tommy Dorsey Orchestra

Photo 2:
The Tommy Dorsey Orchestra - Summer, 1941
The band worked so much overtime in making the movie "Las Vegas Nights" at Paramount Studios in Hollywood that the studio, as a form of compensation, said they have each person's portrait made. This composite shot, used by Dorsey for publicity, was the result. 

Band personnel included [top left] Clark Yocum (vocalist with the Pied Pipers, as well as Dorsey's guitarist), Connie Haines, Frank Sinatra, Jo Stafford, Chuck Lowery, John Huddleston; saxists - Heine Beau, Johnny Mince, Freddy Stulce, Don Lodice; trombonists - Lowell Marti, Les Jenkins, Georges Arus; trumpeters- Jimmy Blake, Ray Linn, Chuck Peterson, Ziggy Elman; drummer- Buddy Rich; bassist - Sid Weiss.

Photo 3:
Tommy Dorsey and Clark Yocum. Picture was taken in 1941, shortly after Yocum acquired Gibson L-5 guitar from Gibson factory, and was used by Gibson for promotional purposes. 

Photo 7:
Connie Haines singing at microphone. Buddy Rich on drums, Clark Yocum on guitar, Phil stephens on bass, Joey Bushkin (breaking in Milt Raskin) on piano.
Frank Sinatra is to the left of Phil Stephens, sitting behind the rhythm section. Continuing, L to R from Frank is Chuck Lowery, Jo Stafford, and John Huddleston, member of the Pied Pipers

Photo 8:
L to R: At microphone, Connie Haines, Chuck Lowery, Jo Stafford, Clark Yocum, John Huddleston, Frank Sinatra; Tommy Dorsey, Buddy Rich, Phil Stephens, Milt Raskin, and Joey Bushkin
(The back of Yocum's Gibson L-5 guitar is visible below the piano in a stand, allowing him to join the Pipers, Connie Haines, and Frank Sinatra at the microphone.)

Photo 9:
Photograph taken to serve as Tommy Dorsey's Christmas card in 1941. 
L to R: Tommy Dorsey, Frank Sinatra, Jo Stafford, Buddy Rich, Clark Yocum, John Huddleston, Chuck Lowery, Ziggy Elman, Connie Haines. 

Photo 10:
Ad lib jam session on train between gigs. Yocum is playing guitar, with Buddy Rich on drums to his left. Date of photo uncertain, but probably sometime in 1941.