C Major Scale Do Re Mi etc

On a Diatonic 10 hole harmonica in the key of C

The notes highlighted are the C Major scale

Up the scale

4 -4 5 -5 6 -6 -7 7

Do Re Mi Fa So La Ti Do

Down the scale

7 -7 -6 6 -5 5 -4 4

Do Ti La So Fa Me Re Do

You can play lots of tunes just using this scale holes 4-7 both blow and draw, here are some tunes that use the notes in the C major scale below

Oh When The Saints

Oh Susana

Michael Row the Boat

On Top of Old Smokey