I support the request for an All view at the top.
My preferred implementation would be a option to select any 3 of All/Audio/Video/Image/Document.
One of MCs key strengths is its ability to manage multiple media types. I take full advantage of this. For any given Artist I frequently have multiple media types such as music tracks, music videos, album art images, and documents about the Artist and her works. Because of this I find I use my All views more frequently than any other view.
By not offering a built-in All view, I think we are short-changing a key and unique strength of MC.