Frances Jane van Alstyne, more commonly known as Fanny J. Crosby, was an American mission worker, poet, lyricist, and composer. She was a prolific hymnist, writing more than 8,000 hymns and gospel songs, with more than 100 million copies printed. She is also known for her teaching and her rescue mission work. By the end of the 19th century, she was a household name.

A hymn is a type of song, and partially synonymous with devotional song, specifically written for the purpose of adoration or prayer, and typically addressed to a deity or deities, or to a prominent figure or personification. The word hymn derives from Greek ὕμνος (hymnos), which means "a song of praise". A writer of hymns is known as a hymnist. The singing or composition of hymns is called hymnody. Collections of hymns are known as hymnals or hymn books. Hymns may or may not include instrumental accompaniment. Polyhymnia is the Greco/Roman goddess of hymns.