u/Phoimos

Isn't this case's clue is a bit too obvious?
Maybe because I can play guitar, but even then I thought Gosho would hide >!the note!< better >!and not use chord for the code!<.

Top panel is how to solve the code. Left middle panel is the murderer's name. Left bottom panel is where to search the name from.

Btw if >!the chords are the dying message!< then the murderer is >!B-A-B-A-C-A-E-D-E which would be Baba Kaede!<.

Or I'm just being deluded right now thinking I can solve a Conan case for once. I swear Gosho would've let Conan be smug about it right before this panel and tell us all the answer next chapter.