Listen to Focus Frequency – 40 Hz for Unstoppable Productivity online. Focus Frequency – 40 Hz for Unstoppable Productivity is an Unknown language song and is sung by Focus Music, Binaural Study Deep Focus Frequency and Binaural Beats Catalogue. Focus Frequency – 40 Hz for Unstoppable Productivity, from the album 40 Hz Focus Frequencies for Deep Concentration, Academic Success, and Productivity Boost, was released in the year 2024. The duration of the song is 3:14. Download Unknown songs online from JioSaavn.