I am concerned. I recently found an old cornet and have been teaching myself to play. From what I could tell, it was a C cornet. I matched it to the sound on my piano. I recently cleaned my horn after getting a new bottle of valve grease, and, when I put it pack together, it's now a Bb cornet? Lol. Like, all the songs I used to play along with are now a whole-tone off/lower. I've matched the C to my piano and it is now a piano's Bb. Did I do something? I must have?
Thanks for the help.