[單字] 請問mellow在音樂上的意思

[nswrth (psycho blue)]

 This song is called Superstar.  It's a very mellow yet cheery song.  The
harmonious timbre of the guitars compliments nicely with Ji Sun's airy voice.
 The song was actually used for the movie, 200 Pound Beauty. It's a pretty
interesting Korean comedy about "an overweight girl who undergoes extreme
plastic surgeries to become a pop sensation".

請問mellow在這是指啥意思呢?
By the way,他所指的歌是這首https://www.youtube.com/watch?v=nNBuQGcVfno

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→ fumei:Relax, easygoing, genial
→ nswrth:難怪 原來不是醇厚的意思喔。relax的解釋真的較適合這首歌