Listen to Kokoro Wo Hiraite online. Kokoro Wo Hiraite is an English language song and is sung by Relax α Wave. Kokoro Wo Hiraite, from the album Deep Sleep Music - The Best of Zard: Relaxing Music Box Covers, was released in the year 2015. The duration of the song is 2:46. Download English songs online from JioSaavn.