YOU SAID:
An accidental played on purpose
INTO JAPANESE
意図せずに偶然演奏した
BACK INTO ENGLISH
I accidentally played it unintentionally
INTO JAPANESE
私は間違ってそれを誤って演奏した
BACK INTO ENGLISH
I mistakenly played it wrong
INTO JAPANESE
私は間違ってそれを間違って演奏した
BACK INTO ENGLISH
I mistakenly played it wrong
You've done this before, haven't you.