strange sounds on rvg recordings/ or i'm crazy

I just recently have discovered jazz. having a great time.something i just noticed on two newly purchased cd's, both bluenote, i hear someone vocalizing during the songs. the first one is art blakey "free for all" and the other is Bud Powell "the scene changes". Am i crazy does any else hear this. I was attracted to jazz, blue note and Rudy van gelder after a discussion between engineers about gelder's secrecy surrounding his recording techniques(mic choice and placement) and that he went so far as to put up different mics for photographs. As i recording hobbyist and i thought that was a cool story even if not true.