Add Custom Music to Champion Select
If you are wondering how to do this, here's a step by step guide I put together. It's pretty easy, took me less then 2 minutes.
Step 1: Navigate to C Drive
Step 2: Open the Riot Games folder
Step 3: Open the League of Legends folder
Step 4: Open the RADS folder
Step 5: Open the projects folder
Step 6: Open the lol_air_client folder
Step 7: Open the releases folder
Step 8: Click the newest release
Step 9: Open the deploy folder
Step 10: Open the assets folder
Step 11: Open the sounds folder
Step 12: Open the ambient folder
Step 13: Take your downloaded song and make 2 copies of it.
Step 14: Rename those two copies ChmpSlct_BlindPick and ChmpSlct Draft_Pick
Step 15: Cut and paste them into the ambient folder.
Step 16: Overwrite the files
Step 17: Launch League of Legends
Step 18: Enter champion select.