“半音”怎么读

“半音”的英语可以翻译为：[音] half-step，half-tone，semit，semitone，halftone ...

那个F是本位音还是升半音？Is that F a natural or a sharp?这首曲子我弹不来 -- 降半音音符太多了.I can't play this - there are too many flats.降B音比B音低半音.B flat is a semitone below the note B....