赞相当棒的演绎，鼓掌！提个小建议，不知合不合适~~

https://www.merriam-webster.com/thesaurus/self-composed

The definition of self-composed is someone calm and collected who has good control over his behavior and emotions.

一般曲子的credit好像这样用就可以了：

[Title] 

Written by/Writer(s) [artist]

Arranged by []

Produced by/Producer [producer]