Sheetmusic Alternative

or by Youtube

#1 sing any song any interval any scale by numbers

Learn the mathematics of welltempered music.
Sing any song, any interval and any scale by the use of one syllable, single, dozenal digits as text.
Compare Standard Music Notation and http://www.HamburgMusicNotation.com
and the software Alternative Notation by http://www.arpegemusic.com