Alto saxophonist Curtis Peagler (1929-1992) fronted a group known as the Modern Jazz Disciples, which recorded two well-regarded LPs for New Jazz (an offshoot of Prestige) in 1959 and 1960.
The group had a rather unique easy swinging sound, due in large part to the use of a normaphone, played by William Kelley. This instrument is a valve trombone in the shape of an alto sax.
The Modern Jazz Disciples disbanded after the two New Jazz LPs and Peagler moved over to Columbia where he recorded a one-off single, It's a Blue World/Low Life, in 1961. This 45 did not lead to an album, a rather rare occurrence when you're talking about a jazz artist, and is now a collector's item.
Peagler is top billed (he wasn't on the LPs) and the "modern" has been dropped from the Jazz Disciples' name.
It's a Blue World
There is no indication of the personnel on this single and I'm not sure if the trombone sound is that of a normaphone. The two sides have not been released digitally.
Peagler went on to spend three years with the Ray Charles orchestra and seven years with Count Basie. He also worked in the recording studios and put out a couple of albums under his own name.
Here's Curtis Peagler with the Modern Jazz Disciples from one of their LPs recorded for Prestige.