Did some Google search and found some likely tunes.
This one is the first two lines of Twinkle Twinkle:
int melody[] = {
NOTE_C4, NOTE_C4, NOTE_G4, NOTE_G4, NOTE_A4, NOTE_A4, NOTE_G4, NOTE_F4, NOTE_F4, NOTE_E4,
NOTE_E4, NOTE_D4, NOTE_D4, NOTE_C4};
// note durations: 4 = quarter note, 8 = eighth note, etc.:
int noteDurations[] = {
2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1};
Here's "Zelda's Lullaby" which I assume is from a video game:
int melody[] = { //Define the melody as being the notes following using those defined in pitches.h
NOTE_E4, NOTE_G4, NOTE_D4, NOTE_C4, NOTE_D4,
NOTE_E4, NOTE_G4, NOTE_D4, 0, NOTE_E4,
NOTE_G4, NOTE_D5, NOTE_C5, NOTE_G4, NOTE_F4,
NOTE_E4, NOTE_D4, 0, NOTE_E4, NOTE_G4,
NOTE_D4, NOTE_C4, NOTE_D4, NOTE_E4, NOTE_G4,
NOTE_D4, 0, NOTE_E4, NOTE_G4, NOTE_D5,
NOTE_C5, NOTE_G4};
int noteDurations[] = { //Define the note durations, 1 to 1 with melody 1 = 8 beats
2,4,2,8,8, // 2 = 4 beats (whole note)
2,4,2,4,2, // 4 = 2 beats (half note)
4,2,4,2,8, // 8 = 1 beats (quarter note)
8,2,4,2,4,
2,8,8,2,4,
2,4,2,4,2,
4,1 };
This might be the lullaby you wanted:
int lullaby[] = { NOTE_G6, NOTE_G6, NOTE_AS6, NOTE_G6, NOTE_G6, NOTE_AS6, NOTE_G6, NOTE_AS6, NOTE_DS7, NOTE_D7, NOTE_C7, NOTE_C7, NOTE_AS6, NOTE_F6, NOTE_G6, NOTE_GS6, NOTE_F6, NOTE_F6, NOTE_G6, NOTE_GS6, NOTE_F6, NOTE_GS6, NOTE_D7, NOTE_C7, NOTE_AS6, NOTE_D7, NOTE_DS7};
int duration[] = { 6, 8, 2.5, 8, 4, 2, 6, 10, 4, 3, 8, 4, 4, 6, 8, 4, 4, 6, 8, 2.5, 6, 8, 8, 8, 4, 4, 2};
Just search for the name of the piece and "NOTE_C4". This will likely turn up some Tone music.