In combination with the bass lines he played, creating a stronger presence. it also made the bass player think in a melodic fashion rather than limiting its function to the outlining of basic chords.

Slam Stewart

Explanation:

Slam Stewart was a musician who is mostly known for his double bass music. He was well known in the jazz community for his unique style in playing the double bass.

He would bow the double bass (as opposed to many jazz musicians who would pluck the strings to provide a rhythmic background setting to the melodic music of the other instruments) and simultaneously he would sing or hum with his playing.

His humming or singing would often be an octave higher than what he was playing on the bass, which made the music very pleasant to listen to. His background as a violinist may have given him the idea to introduce another voice in a higher octave.

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