In no uncertain terms, Prince is one of the most important musicians of the 20th century. Between 1980 and 1988 he released a series of albums that are still startling in their invention, originality, and scope. As a pop star, he remains an enigma, and as a performer he is arguably unrivalled. However, the last twenty years have not been kind to him, and as he stages another attempt at grabbing the public’s interest with the simultaneous release of Plectrumelectrum and Art Official Age, we look back at his 1986 classic Parade, and wonder, where did it all go wrong?In many respects, Parade shouldn’t work. It’s the…