Kazuo Shinohata - Kazuhiko Sawaguchi - Kouhei Tanaka are the composers.
It too:
Opening Theme:
"Boomerang Boogie ~Nanpudou no Ojisan~" by PE'Z
Ending Theme:
"Song for My Buffalo" by PE'Z
http://www.ongen.net/search_detail_track/track_id/tr0000016635/
I know not so that's right, but the piece is called Boomerang Boogie and consists by several persons. Nottament PEZ I believe.