What is "tonante"

Tonante, initially called Ao Rei dos Violões Limitada (To the King of Acoustic Guitars in English), was started on April 5 of 1954 by the Portuguese brothers Abel and Samuel Tonante who artisanelly built musical instruments, thirteen years after their arrival in Brazil. Tonante is well known for making highly affordable stringed instruments in Brazil, together with companies such as Giannini, Del Vecchio and Di Giorgio.