From Kirbypedia

Hirokazu Ando (安藤 浩和 Andou Hirokazu) is a music composer employed by HAL Laboratory around 1991. He has worked on mostly Kirby games and is infamous for his work on the first two Super Smash Brothers games.

His music style is hard to perfectly describe. In his early works, the music had a Jazz-like flare to it, but that faded as time went on. For working on the Kirby games is pretty distinct, as it could only be classified as "Kirby Music", but his work for the Super Smash Brothers games seem to show slightly different stripes.