What are the 12 notes of blues scale in letters?

The blues scale consists of the following 12 notes in letters: C, C#, D#, E, F, F#, G#, A, A#, B, C, and D. In a typical C blues scale, for example, the notes would be C, Eb, F, Gb, G, Bb. The scale includes the minor third, perfect fourth, diminished fifth, perfect fifth, and minor seventh. This combination gives the blues its distinctive sound.