 Other significant figures playing keyboard-based blues include James Booker, whose organ instrumental "Gonzo" reached the top fifty in the Billboard chart in 1960 and was followed by a series of minor single hits.The most significant blues guitarist to emerge from the city in the post-World War II period was Guitar Slim.Originally from the Delta, his "The Things That I Used to Do", which combined gospel, blues and R&B, was a major R&B hit in 1954 and may have influenced the development of later soul music.