Hi Rene,
 
Your little song reminds me of the Feast of Trumpets and the new moon, when the Jews are watching for the first sliver of the moon to begin Rosh Hoshanah.
 
  
 
It also reminds me of these verses:
 
Psalm 81:3
Blow the trumpet at the time of the New Moon, At the full moon, on our solemn feast day.
 
Numbers 10:10

10 Also at your times of rejoicing—your appointed festivals and New Moon feasts—you are to sound the trumpets over your burnt offerings and fellowship offerings, and they will be a memorial for you before your God. I am the Lord your God."