The term 'HALLELUJAH! Singers' refers to a CHOIR, which is a group of singers who perform together. A CHOIR typically consists of multiple parts, such as soprano, alto, tenor, and bass, and is often accompanied by an instrument or two. HALLELUJAH! Singers are usually associated with religious music, although they can also be found performing secular music. The term is derived from the Hebrew phrase 'HALLELUJAH, ' which means 'praise the Lord.'