MIDI files do not have any vocals. Tha is why I prefer them over removing vocals from .wav files.
The additional advantage of the MIDI files is that usually, a single instrument carries the melody. This instrument can be controlled as to type (even a synthesized vocal, like ooohs) and loudness, so that you can listed to the instrument in the background carrying the tune. This is helpful in two ways. One to cue the sweeping and two to help vocalist with the melody. You can also removed completely if that is the best for you.
BANDL
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