About us Piano tuning is my passion, and I have been tuning pianos since 1998. For those of you not Dutch - my name is pronounced as follows: with 2 syllables KAM - STRA (kam-stra) (Origins are Frisian-Dutch) I love nothing more than making my customers smile when they hear the splendid sound of a newly tuned piano. With each tune, I will adjust the strings to concert pitch (A-440 htz). I tune pianos for residential, schools and churches. I cover parts of Los Angeles county (south of 605 freeway), Orange County, Riverside, and San Diego.