There was a lot more to Leon Haywood than his 1975 hit “I Want’a Do Something Freaky to You.”  Texas native Haywood played keyboards for Sam Cooke, masqueraded in studio bands The Packers and The Romeos and scored his first solo pop hit with 1967’s “It’s Got to Be Mellow.”  When he began incorporating funk and disco sounds into his brand of soul, however, Haywood found his niche.    Big Break has recently celebrated the Haywood ouevre with expanded editions of his 1980 platter Naturally and the 1981 self-titled album by Carl Carlton…