Hoi buonconsiglio,
Sorry to tell you that your map have been rejected.
The theme is not really original, there is already some "Music" themed maps on Parkour. The build could be better, the main flaw for me is the amount of floating jumps, try to build your map on/in a main build, and not floating around like you did, after the rest is decent. The parkour could be better too, it's a bit varied, but still a bit repetitive, try to use different blocks for your parkour through the map, and not using for example cobblestone wall in one part, and never using it again after.
Thanks for submitting your map, would be really good to see more maps from you !