Probably tape print through, happens all the time. Recording tape has metal oxide particles that are oriented with a magnetic field in the recording head, and they retain some of that magnetic charge. So if the tape is wound tightly and/or stored for a long period, one layer of the tape can impress a signal onto the layer above or below it. With a typical tape reel size and speed, the delay would be in the range of one to two seconds. You generally only notice it in the quiet lead-in to a song, hence it is often called pre-echo. On the CD they would probably just edit it out.
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