Listen to Hard Working - Concentration Music online. Hard Working - Concentration Music is an Instrumental language song and is sung by High Focus. Hard Working - Concentration Music, from the album Deep Study Music for Exams and Concentration – Deepen Your Concentration with the Perfect Music for Studying and Brain Stimulation, was released in the year 2018. The duration of the song is 5:05. Download Instrumental songs online from JioSaavn.