Here are some clues if you get stuck. They go from less information all the way to giving the solution
Clue 1/2
There is a clue to the third number in the code in the thumbnail
Clue 3
The clue is the dots and dashes at the bottom right
Clue 4
Pay attention to the melody of the song
Clue 5
The rhythm of the melody is important
Clue 6
The rhythm of the melody is composed of SHORT sounds and LONG sounds
Clue 7
The melody can be divided into four equal sections composed of 5 notes
Clue 8
What kind of code uses short and long sounds?
Clue 9
Morse code uses short and long sounds
Clue 10
Each section of the melody encodes one number
Clue 11
The first section of the melody is short-short-long-long-long
Clue 12
G is one floor below 1
Clue 13
The ground floor can also be thought of as zero
Solution
The full code is 2-5-7-G, where G = zero
