Problem: I wrote you a song. Put it in the picoCTF{} flag format
File: THE_FILE
Solution: The hint says: Do you think you can master rockstar? So rockstar is a language. (https://codewithrockstar.com/) Theres an online try section where we can run the code.
Putting the code into the section and nothing into the input. Give the following output 114 114 114 111 99 107 110 114 110 48 49 49 51 114 Which you convert from decimal to text and get rrrocknrn0113r
Flag: picoCTF{rrrocknrn0113r}