sentences:  At sixteen, Schacher caught his first professional break when he was invited to replace bassist Frank Lugo in Question Mark and the Mysterians, and he supported their hit "96 Tears" (1966) on their 1967 tour.During this stint, he was approached to join former Terry Knight and the Pack drummer Don Brewer and singer/guitarist Mark Farner – who had been working as the Fabulous Pack but sought to change musical direction – to form a new power trio.Intrigued by the power trio concept, Schacher joined the new lineup, and almost from the moment they played the 1969 Atlanta International Pop Festival, inspiring a rousing reception and fast-spreading word of mouth, they achieved international fame as Grand Funk Railroad.