Use the adjective melodious to describe something that sounds like music, like a babbling brook or a little boy's soft humming.

Anything that makes a pleasant, tuneful sound can be called melodious, which makes sense when you spot the word melody in melodious. Both have a root in common, the Greek word meloidia, which means "singing, or a tune for lyric poetry." It, in turn, comes from melos, or "song."

Definitions of melodious

adj having a musical sound; especially a pleasing tune

tuneless, unmelodious, untuneful
not having a musical sound or pleasing tune

adj containing or constituting or characterized by pleasing melody

“the melodious song of a meadowlark”
melodic, musical
ariose, songlike
having a melody (as distinguished from recitative)
canorous, songful
richly melodious
cantabile, singing
smooth and flowing
dulcet, honeyed, mellifluous, mellisonant, sweet
pleasing to the ear
suitable for or suggestive of singing
unmelodic, unmelodious, unmusical
lacking melody

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