Listen to This Old Heart Of Mine (Is Weak For You) (Single Version / Mono) online. This Old Heart Of Mine (Is Weak For You) (Single Version / Mono) is an English language song and is sung by The Isley Brothers. This Old Heart Of Mine (Is Weak For You) (Single Version / Mono), from the album This Old Heart Of Mine & Soul On The Rocks, was released in the year 2002. The duration of the song is 2:46. Download English songs online from JioSaavn.