Veteran Charlie Parker collectors generally know that they should avoid all but his most famous live sessions.
It is not that Parker plays badly (in fact his solo on "Confirmation" is quite miraculous) but, as is often the case with these privately recorded sets, the recording quality is horrible.
Bird (with trumpeter Red Rodney, pianist Al Haig, bassist Tommy Potter, and drummer Roy Haynes) plays quite well but these versions only hint at what the music must have sounded like.