Listening to a favorite song with headphones but not the left ear to the left signal and the right ear to the right signal ie not in stereo but in the following way:
A special headphone socket plug adapter must be made so that both ears listen to the difference signal that is R-L or L-R. Next euroelectron post describes how the adaptor is made.
This is also called the karaoke signal.
When listening to the L-R signal the bass and the voice which are normally equal at both channels disappear.
At the same time all the subtle vocals and choirs are magnified as they usually are spread to full left and full right.
This is a nice way to study how those beautiful harmony vocals are done on pop music.
For example on the following beautiful song when the chord is A major all the girls sing A, all again multitracked C# and all again multitracked E. Then they keep singing those notes while the bass changes from A to F# and automatically an F# minor 7th chord (F A C# E) is created.
Babe don't go - Close II You
https://m.youtube.com/watch?v=Xt6-Wf_ryTM
A guess is that apart from the great ability of the singers they must have been listening to the backing track at very low levels to aid them in the extraordinary intonation. Pitch perception depends on intensity level as well as frequency.
Reference: Sound and Hearing - Stevens Warshofsky - Time Life science library
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