词汇网络: hum

Refers to the surrounding environment or the background conditions of a particular area, such as temperature or light. As a noun, it specifically identifies a genre of electronic music characterized by atmospheric sounds and a lack of a persistent beat.

The quality in a sound of being deep, full, and reverberating; also, the power to evoke enduring images, memories, or emotions.

A melody is a sequence of musical notes that are pleasant to listen to and form a main tune. It is the part of a song that people usually hum or sing along with.