Library play notes in an easy way with your piezo buzzer. Just enter the notes as a string and play them.
You can use all common notes C-D-E-F-G-A-B and the corresponding octaves 1,2,3,4,5,6 and 7.
c4 is the note c in octave 4
Write -= if you want to "play" a pause.
melody_channel := Melody 26
melody_channel.play "e4e4-=e4-=c4e4-=g4-=-=g3"
Melody 26 will create a Melody object using the GPIO Pin 26. Make sure the Pin you are using has PWM capabilities.