As the saying goes -- "Out of tune notes have the same rights as notes that are in tune, so they have every right to be heard". Supporting this, is the great Bossa nova song "Desafinado" whose title means "Out of tune" - although one can say it is anything but 'out of tune' and just all brilliance, soul etc. Listening to the lovely voice of Elis Regina sing it, is taking it to another level. Take a listen --
And now, listen to the masterpiece "Ayirathil Naan Oruvan" by the great south Indian composer A.R.Rahman. The bassline of Desafinado is intact :-) But the melody that follows is so alluring that the charm remains even after 15 years of listening.