“Solar” is a tune written by Miles Davis and is featured on his hit record “Walkin”.
However there is a controversy over this tune regarding authorship and some say that Davis’ “Solar” is essentially the same as a previously written tune called “Sonny” by guitarist Chuck Wayne.
It was not uncommon for Miles to take credit for tunes that he did not write.

Regardless, this tune has certainly been made popular by Miles Davis and is an essential jam session tune.
You can consider the most common key of this tune to be C minor, however you will notice that it goes through four tonal centers: C minor, F major, Eb major and Db major.

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Videos to learn the melody/changes