"what they called Waldorf music"

This is probably a reference to the type of music produced under the Waldorf Music Hall budget record label which was established in America in the early fifties. The label specialised in jazz, rhythm and blues, gospel, and pop records which were sold exclusively through Woolworth Stores.  The label became part of Am-Par records in 1959. Some Waldorf Music Hall recordings, such as those of the gospel group the Deep River Boys, are still sought after today.