'Concert key' or C- instruments are : all keyboards, guitar, banjo, bass, flute, recorder, trombone, violin, accordion, mouth-organ ('harp'), voice.
Bb instruments
: trumpet, clarinet, soprano-sax and tenor-sax
To match the concert key of keyboards,
flutes etc. play in the key 2 semitones
higher.
For example for the Blues in C : play in the key of D
For the Blues in F : play in the key of G
Eb instruments
alto-sax and baritone-sax
To match the concert key of keyboards, flutes etc. always play in the key 3 semitones
lower.
For example for the Blues in C : play in the key of A
For the Blues in F : play in the key of D
The notation for scales and chords are suitable for all instruments.
(There are instruction for where to start for each play-a-long tracks.)
Separate sheet music for the three types of instruments is included for all songs.