Major 251s All 12 Keys The 251 progression is the most common progression in jazz. It is the DNA of jazz music and it must be learnt and memorised in all 12 keys. 3-Note 251 Progressions PDF File Type: pdf Join PianoGroove Pro to access all downloads and learning resources. Download theory supplements, midi files, chord changes and full note-for-note transcriptions of every lesson. Learn more about pro membership >> Download