Can anyone please recommend me with a story similar to Beck?

Well by the same author there is RIN it's about MC who wants to be a mangaka it's good and different from bakuman
https://www.mangago.zone/read-manga/rin_harold_sakuishi/

or with music as a focus you have :
https://www.mangago.zone/read-manga/shiori_experience_jimi_na_watashi_to_hen_na_oji_san/
this one is fun and deturn the 27 club in an interesting way.

the other I would recommand but it's not talking about rock music is :
https://www.mangago.zone/read-manga/piano_no_mori/
this one is a masterpiece.

With really good wrtting you also have:
https://www.mangago.zone/read-manga/kono_oto_tomare/
https://www.mangago.zone/r/l_search/?name=Shigatsu+wa+Kimi+no+Uso
https://www.mangago.zone/read-manga/given/

Hope you like it if you didn't already read them.

Woah! Thank you so much! Appreciate it. :)

you're welcome ^^