I used wget to get the file downloaded
wget "https://raw.githubusercontent.com/JEF1056/riceteacatpanda/master/BTS-Crazed%20(75)/Save%20Me.mp3"

Being given an audio file, my first impression was to get an audio spectogram of the mp3, but that didn't lead to anything.

Next, I tried using strings in terminal along with grep which gave me the flag directly

command: strings Save%20Me.mp3 | grep "rtcp"

flag: rtcp{j^cks0n_3ats_r1c3}