How do I add music to singing covers without using a karaoke app or musical instruments?

I've been meaning to upload videos of myself doing song covers. I have an iPhone 5s, a laptop, and headphones (But no mic or camera.)

Two tape recorders side by side.

I don't know what "singing covers" or "song covers" are. If you're going to do a cover version of a song then you either do it without any instrumentation - vocals only, or you would need a backing track to sing over.

An instrumental version and your voice singing with it into a recording instrument

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