Symbols' Mystery

Exploration Stage: Organ Room
From: Detective
Description: What's to be done? No matter how much I press the keys, the jukebox keeps playing its pre-recorded melody. Do you recognise these symbols? They're also on the Station Clock! It seems that the keys with symbols on must be pressed in the same sequence as on the Station Clock, but only here, in the past! Bring my diary. I wrote the order of symbols inside it.
Completed: Open the diary. The sequence of symbols you must play on the keys is here. Play carefully, my friend! The life of the City depends on those keys! The first symbol, then the second... Now you've played the correct melody!