Yes, that's a pretty thing. My old buddy Gene Quill used to tell me about working in Mulligan's big band, but that was long before this was recorded. He told me how much he enjoyed the music, and he wasn't that complimentary about too many musical situations.
There's a cool thing on the sidebar. Check out the Paul Desmond and Jerry Mulligan version of 'All The Things You Are', The pic shows Jerry blowing a mk6 bari.