I'm not sure if this goes in the Music Theory section or what, so I'm sorry if I'm mistaken. I'm new I was wondering about the actual differences in the Dragonetti Concerto in A Major and the one in G Major. I have a copy of the music and it says it's in A Major, yet the key signature is in G. I have an audition this summer for a Solo competition (to play with an orchestra) and the edition they told me to buy, from Luck's Music Library, says the version to be played with Orchestra is in G, yet the solo version I have for piano is in G as well, though it says it's in A. I'm quite confused. Are there two different versions of the Concerto, or is there no actual version with a A Major key signature?(which would suprise me.) Also, the solo version I have has this "tuning" bar with a, descending: Top line A, then an E, then a B, then a low F-sharp. I have absolutely no idea what this bar means. Any explanations will be appreciated.