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The TROMBONE CHART - 12 SCALES 8.5"X11" is a chart which includes 12 scales with slide positions for every key.  Transpose and improvise in any key.  Easy to use.  For instance, if the first chord of a song is C Major, like the song chords: C Am F and G, transpose and improvise using D Major scale or D Major/m7 scale.  Usually, the first chord indicates the key.  If the chords of a song begin in Em, use F#minor or F#minor/Maj6 scales to improvise.  So, if the guitar or piano or the string section are playing in the key of C minor, you could improvise by transposing the notes to D minor. The scales show every note for those 4 related keys.  Try it!  Be sure to add me to your favorites list!