Just Friends is a very important standard. It was first written as a ballad, but Charlie Parker changed all of that with his “With Strings” recording. It is now played as an uptempo chart most of the time. It’s a fun tune with nice changes. It’s most commonly played in F major or G major, but the first chord starts on the IV (Bb in the key of F, C in the key of G). Even though F or G seem to be the most common keys, Parker, Stitt, and Woods all did it in Ab.