Sounds like a lot of pre '78 guitar/bass/horns/keys solos/intros are potentially non-copyrighted in the USA, because they were not transcribed into written musi

Sounds like a lot of pre '78 guitar/bass/horns/keys solos/intros are potentially non-copyrighted in the USA, because they were not transcribed into written musical notation. You'd still probably need deep pockets at some stage to pay a legal weasel to defend you from another legal weasel suing on behalf of the estate of a dead or aged musician.