Jazz LPs from the 50s and 60s

[Waxx]

And the musicians knew how to listen to each other , play with sympathetic dynamics AND get a good sound from their instruments. Must have made it easy for Rudy

Off course, that is the basic to be able to do that that way. But at that time (the early 50 when he started) there was not much possible to fix bad musicianship in the studio like now.