If you're looking for manga similar to Bad Mood, you might like these titles.
The stage is set when Ichirou Gomen, a newbie producer of the record company Gaia loses yet another production opportunity to inexperience. Wanting to pass on his childhood dreams of stardom to a fledgling singer, he toils learning the process day by day through failure. However, his life is sent into a loop when he follows a beautiful performing voice, the voice of Jam Hiiragi, playing live to a group of homeless people at a streetside. Wrangling the prodigy talent and her bratty complications, together they face off and challenge the professional world of the music industry.
Guitar Shop Rosie is a guitar repair store run by two brothers, Angus and Malcolm, who aren’t good at making money, but love AC/DC and rock music.