Few would challenge the claim that the 1960s and 70s have been the most fertile two decades in the history of popular music ever - a period which, regardless of genre, laid the foundations for everything that has followed. What is more, this period was so fertile that the speed with which tastes changed left a colossal amount of incredible music to gather dust - perhaps most famously a profusion of funk, soul and jazz. It was a musical legacy that lay mouldering until the rise of sampling in late 80s hip-hop precipitated a mad scramble for lost crates and suddenly, the music that became known as 'rare groove' - for obvious reasons (it was rare and very groovy) - experienced a phoenix-like rebirth.