In 2018, 11-year-old Alex Bonadonna, his 8-year-old sister Addi (along with their bandmates and manager/Dad) launched “Leave Those Kids Alone”, dreaming of though likely never imagining the success that they’d have, performing over 400 shows across Ontario, Michigan and beyond.

In September of 2025, after one final summer filled with shows to appreciative audiences of their classic rock tribute show, Alex, Addi, Luca Angelini and Louis Diab wrapped up the “Graduating Tour” of Leave Those Kids Alone, closing an incredible chapter and making way for ultrasonik.

ultrasonik was introduced in May 2025 as the name under which new original songs would be released under. Accordingly, ultrasonik’s Mach One album features 12 songs, following up on groundwork album, released by Leave Those Kids Alone in 2022 and the Invisible Enemy single release in 2021.

The new name allows ultrasonik to form its own unique identity, based solely on their creative works vs. their classic rock tribute show performances.

Brother-sister duo of Alex and Addi are paired with Luca, as they have been since 2021.

The band remains a go-to act for summer concerts series events, annual festivals, public gatherings, corporate engagements and even weddings! Through their online videos of classic rock hits, ultrasonik (and Leave Those Kids Alone) have reached every corner of the world earning millions of views!