Chicago rock veteran Mark “SPIV” Grzelak has been writing, recording, and performing for decades, earning a reputation as a passionate and seasoned performer. With thousands of shows and 14 releases to his name — spanning bands like Simple Simon, Frosting, Javelinas, Blackmaker, and Decibella — SPIV continues to showcase the honest, heartfelt spirit of classic rock and roll. His shows blend timeless favorites, deep cuts, and original songs, all delivered with the authenticity and grit that define this Chicago natives enduring rock tradition.