Confused by 的 and 地 in 掉的那么地刺耳
I think there's a mistake in the lyrics, IMO it should be 掉[得]那么地刺耳 since 刺耳 is an adverb for the verb 掉 here. So the lyrics basically says (tears) are dropping so harshly.

BTW there are tons of grammar errors in Chinese pop lyrics.