Every piano scale: its notes, key signature, fingering and chords, on a keyboard and a staff you can hear and play. Free.
The reference scale of Western music: seven notes, with half steps between degrees 3 and 4, then 7 and 8. Bright and stable, it gives the major keys their names.
C major scale · D♭ major scale · D major scale · E♭ major scale · E major scale · F major scale · F♯ major scale · G major scale · A♭ major scale · A major scale · B♭ major scale · B major scale
The natural minor scale: the same notes as its relative major, starting from the 6th degree. Darker, it colors countless songs.
C minor scale · C♯ minor scale · D minor scale · E♭ minor scale · E minor scale · F minor scale · F♯ minor scale · G minor scale · G♯ minor scale · A minor scale · B♭ minor scale · B minor scale
The minor scale with its 7th degree raised a half step (the leading tone): it gives a major dominant chord, and a step and a half between degrees 6 and 7 that lends it its exotic flavor.
C harmonic minor scale · C♯ harmonic minor scale · D harmonic minor scale · E♭ harmonic minor scale · E harmonic minor scale · F harmonic minor scale · F♯ harmonic minor scale · G harmonic minor scale · G♯ harmonic minor scale · A harmonic minor scale · B♭ harmonic minor scale · B harmonic minor scale
Five notes, no half steps: the major scale without its 4th and 7th degrees. It can’t sound wrong, hence its success for improvising, from folk music to pop.
C major pentatonic scale · D♭ major pentatonic scale · D major pentatonic scale · E♭ major pentatonic scale · E major pentatonic scale · F major pentatonic scale · F♯ major pentatonic scale · G major pentatonic scale · A♭ major pentatonic scale · A major pentatonic scale · B♭ major pentatonic scale · B major pentatonic scale
Five notes: the minor scale without its 2nd and 6th degrees. It is the scale of rock and blues, and the simplest one to start improvising with.
C minor pentatonic scale · C♯ minor pentatonic scale · D minor pentatonic scale · E♭ minor pentatonic scale · E minor pentatonic scale · F minor pentatonic scale · F♯ minor pentatonic scale · G minor pentatonic scale · G♯ minor pentatonic scale · A minor pentatonic scale · B♭ minor pentatonic scale · B minor pentatonic scale
The minor pentatonic plus one note, the “blue note” (the flat fifth): six notes, enough to improvise over a blues.
C blues scale · C♯ blues scale · D blues scale · E♭ blues scale · E blues scale · F blues scale · F♯ blues scale · G blues scale · G♯ blues scale · A blues scale · B♭ blues scale · B blues scale