Answer:

atune

Answer	Crossword Clue
ATUNE	Hum .. (make some music)
ATUNE	Carry ..
ATUNE	Hum ..

ATUNE	Carry ... (sing on key)
ATUNE	Carry ..: sing on key
ATUNE	Carry .. (sing OK)
ATUNE	Harmonious.
ATUNE	In accord.
ATUNE	In harmony.
ATUNE	"While mammy hums ...."
ATUNE	Play us ....

ATUNE	In harmony
ATUNE	Hum ...
ATUNE	Carry ... (be melodic)
ATUNE	Carry ... (retain a melody)
ATUNE	" . . . I am disposed to harmony . . . incapable of ...": Lamb
ATUNE	" . . . I am incapable of ...": Lamb
ATUNE	Carry ... (sing on pitch)
ATUNE	Carry ...

ATUNE	Carrying ...
ATUNE	What some musicians carry