Hummable tune (6)
I believe the answer is:
melody
(Other definitions for melody that I've seen before include "Refrain" , "A pleasant tune or song" , "Harmonious tune or song" , "Musical line" , "Musical theme" .)
I believe the answer is:
melody
(Other definitions for melody that I've seen before include "Refrain" , "A pleasant tune or song" , "Harmonious tune or song" , "Musical line" , "Musical theme" .)