Most music and lyrics in his entire career were never written by Ozzy including his days in Black Sabbath. He got into many legal feuds with former band member over writing credits which he took the credit for despite multiple sources saying otherwise preventing proper royalty payments from being collected. According to former band mates he rarely showed up to writing sessions or rehearsals and would only contribute a rhythm that he would hum or sing before leaving the studio or rehearsal space to go do more drinking/drugs.