Ranking among America’s most influential and versatile musical figures, Allen Toussaint excelled as a songwriter, arranger, session pianist, and producer. His influence extends across the popular music landscape; though he is most often associated with the music of his native New Orleans, he enjoyed success in R&B, jazz, country, blues, and pop. His piano playing blended the wealth of Crescent City styles, barrelhouse blues, marching band references, jazzy intervals, and sweeping octave leaps.
By the late 1950s Toussaint was already cranking out hits and frequently doubling as keyboard player and/or producer. In the 1960s two of his instrumentals became huge pop standards—Java for Al Hirt and Whipped cream for Herb Alpert. Glen Campbell’s version of his Southern nights was nominated for the Country Music Association Song of the Year award in 1977, and he was inducted into the Rock and Roll Hall of Fame in 1998.
This according to “Toussaint, Allen” by Ron Wynn (Encyclopedia of the blues II  pp. 1005–396); this encyclopedia is one of many resources included in RILM music encyclopedias, an ever-expanding full-text compilation of reference works.