Practice playing them. Memorize the pattern steps.
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They don't all have black notes. The scale of C Major contains the notes C, D, E, F, G, A, B, none of which is black.
Well the 12 major scales of the alto saxophone are C,F,B(flat),E(flat),A(flat),D(flat),g(flat),B,E,A,D, and G.
There are 7 white notes, and 5 black notes on the piano, so all together you have 12 different notes, and therefore, 12 different sounding major scales.If we include the three enharmonic ones - that makes fifteen key signatures and, therefore, fifteen major scales in total.They are, from the flattest key (the one with the most amount of flats) to the sharpest key, in order: Cb, Gb, Db, Ab, Eb, Bb, F, C, G, D, A, E, B, F# and C#. These are all the "real keys".Now, if you want to get theory crazy - you can look at the "imaginary scales" as well - which are scales you can figure out theoretically, but you wouldn't use them for practical reasons. This would include keys like D# Major (9 sharps) and Gbb Major (13 flats), in which case there would be an additional 20 major scales (one for every note and its enharmonic equivalent) as well, making a total of 35 scales (for the 15 real key signatures and the 20 imaginary keys).
Memorize them all.
Gâ™­ major has the most flats - 6 of them, in fact: G â™­ Aâ™­ Bâ™­ Câ™­ Dâ™­ Eâ™­ You could argue, however, that there are other scales with even more flats, such as Câ™­ major (which has 7 flats). Câ™­ major is actually exactly the same as B major (which has 5 sharps), and, of these two forms, B major is the name (and key signature) used. Other major scales that use more than 6 flats, such as Fâ™­ major (which is equivalent to E major), end up having double flats (notated as â™­â™­), so things start to get unnecessarily complicated and messy to write.