Own a website? Manage your page to keep your users updated View some of our premium pages: google.com. yelp.com. yahoo.com. microsoft.com. Upgrade to a Premium. Aug 28, 2015 Learn about and follow jazz musician Jimmy Knepper (Trombone) at All About Jazz. Jimmy Knepper- A Swinging Introduction. Jimmy. Available as MP3, MP3 320, and FLAC files. Pepper Adams and Jimmy Knepper had the cleverly named 'Pepper- Knepper from early swing to free jazz and beyond using various instrumentations. It features a classical- sounding intro and coda – an exquisite melody by Tom – with a group improvisation in between.