diào​zi

melody

调子 (調子) diào​zi
melody noun
a musical tune, melody, or the specific pitch/tuning used in a piece of music

The tune of this song is very beautiful; you can remember it after hearing it once.

intonation noun
the cadence, intonation, or specific tone of voice used when speaking

His tone of voice sounds a bit impatient.

Frequency

Movie subtitles
2.41 per million appears in 1% of films
Written text
1.53 per million

Sources

Definitions
CC-CEDICT