the order of sharps in a key signature is
Key signature Put another way: for key signatures with sharps, the first sharp is placed on F with subsequent sharps on C, G, D, A, E and B; for key signatures with flats, the first flat is placed on B with subsequent flats on E, A, D, G, C and F. There are thus 15 conventional key signatures, with up to seven sharps or flats and including the empty signature of C major (A minor).
Time signature For instance, 2 4 means two quarter-note (crotchet) beats per bar, while 3 8 means three eighth-note (quaver) beats per bar. The most common simple time signatures are 2 4, 3 4, and 4 4.