His pen name represented the transposition of his initials and his middle name.
他的笔名是他姓名首字母与中名顺序的颠倒。
3VERB 使(乐曲)变调 If you transpose a piece of music, you perform it or write it in a musical key which is different from the original one. 使(乐曲)变调 [technical] [Also VERB n]
She could play any piece of music she heard and transpose it into any key. [VERB noun into noun]