Born in a family of five, with two siblings a brother and sister: Aaron's ear for music was spotted while still a toddler. At three years of age he was already rhythmically drumming using everything in sight - small wonder the first instrument he picked up was the drum set.
Aaron “Krucial Keys” Rimbui started playing the drums in 1990 when his father bought him a 4 piece drum-set. After assembling it, he proceeded to carry it to church, and it was not long before he was declared the official church drummer.

Little did he know that his career in music would be greatly influenced by his attendance of an overnight prayer meeting at the Nairobi Baptist Church. There, he came across two exceptionally gifted guitar players, J.J Ojiambo and Kung'u Mbathi (of Four Winds). Aaron later joined the I.B program at St. Mary's, and on his very first day there, while attending auditions for the annual school musical, he comes across the very same guitarists playing in the band. This began a budding music relationship and after a few months of playing together they formed the band Jazz It All; members being Aaron, Kung'u, JJ and now-producer Gideon Kimanzi. He is now part of the band providing the amazing soundtrack for Mofaya the Musical. It’s fantastic seeing him pick up the cue by ear.