The Urf music in particular seems fairly loudly recorded, but I'm pretty sure most all of the launcher musics I've heard since I started playing have been on the loud side. The mouse click sounds seem normal/quiet but the music is just BOOM!
RiotUtora5 votesGood ears mate. We noticed this too and are looking into it. I think the URF music was mastered slightly different than regular logins and we think that there may be something in the launcher code that is adding additional gain stages that are unnecessary, especially for the URF music. I think someone is looking into changing that.
RiotChemicalseb2 votesThanks for bringing this up! Having something blast your ears is definitely not fun. :( We're really sorry about that. Like Utora mentioned, we've been working on tracking down what caused the exceedingly loud volume on this particular login. The track itself was mastered at a normal level and is quieter than what comes out of the launcher at default settings, so something somewhere in the code is boosting the track past its nominal level.
Tsugaga1 votesYou can change the League volume in your options.
Anoni K2 votesIf you mean the options in the first screen (gear icon on the window with the LAUNCH button) that volume has no effect on the login music. But it appears the one once you've logged in does handle it.
edit: My mistake, it looks like neither of the 2 volume controls affects the intro music. So you only get off or really loud.
Melfino1 votesThe music is indeed real loud.. But the song rocks so it's acceptable :D 
NorthernDruid1 votesYeah, the launcher music is so much louder than the in-game sounds.
It's a pain to manage sound levels all the time.