Another factor that creates this “music” is noise introduced by the tape. In the 60s my brother and I experimented with slowing down speech. We recorded a sentence at 7-1/2 ips on one machine, played it back at 1-7/8 ips into the mike of another machine.running at 7-1/2, and so on. With each iteration tape hiss and mike noise were added to the mix and they got distorted, too. The finished ten-minute extravaganza sounded something like a World War II submarine using sonar. Gee, tape recorders were fun.
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