Ska and punk rock were first combined during the 2 Tone movement of the late 1970s, yet the fusion of the two genres became most prevalent in the 1980s, during the third wave of ska, and this is what most people associate with ska punk. During this time period Operation Ivy formed in 1987 in the East Bay area of San Francisco and is widely considered a pioneer of the genre as one of the first bands to mix hardcore punk with elements of ska, later known as ska-core. The characteristics of ska punk vary, due to the fusion of contrasting genres. The more punk-influenced style often features faster tempos, guitar distortion, onbeat punk rock-style interludes (usually the chorus), and punk-style vocals. The more ska-influenced style of ska punk features a more developed instrumentation and a cleaner vocal and musical sound.With these newer sounds at their disposal ska bands were finally ready to take the US by storm.
Operation Ivy, founder of the ska core sub genre