Works on Marimba and Piano
Numbers (0-9) = Piano
Letters (Q-P) = Marimba

1-1-3-1-6-5
Q-Q-E-Q-Y-T
[Hap-py-birth-day-to-you]

1-1-3-1-8-6
Q-Q-E-Q-I-Y
[Hap-py-birth-day-to-you]

1-1-0-8-6-6-5-3
Q-Q-P-I-Y-Y-T-E
[Hap-py-birth-day-hap-py-birth-day]

0-0-9-5-7-5
P-P-O-T-U-T
[Hap-py-birth-day-to-you]

I hope you can understand it easily!