In the fifties, editing and overdubbing was rare. Pop vocals, jazz, classical, popular, easy listening, rock n roll and country music were almost always recorded and mixed live to tape in complete takes, or at the most mixed down from three track masters. The only real post processing was assembling the selects into album order and fixing fade ins and outs. In the sixties, editing and overdubbing became more common in pop music, mostly after the Beatles' Sgt Pepper. Before that, overdubbing was limited to Les Paul and a handful of novelty pop records.
In the late 40s, many recordings were cut live to high fidelity 33 1/3 lacquer master disks, with multiple 78rpm length takes on a single disk. After the beginning of the LP era, these recordings were dubbed to LP live on the fly DJ style. If you listen to the very earliest classical Columbia LPs, you can hear slight miscues And speed fluctuations as the engineer slip cues and pots from one master disk to the next.