When I want to play something from my music library, I usually want to listen to a specific artist or album. Scrolling down to an artist and selecting them works well. I can shuffle everything by that artist or listen to an album—great! However, if the artist is pretty far down the list (alphabetically), there's not a way to get to them quickly, so I perform a search.
When you search for an artist, the "Tracks & Artists" tab doesn't help. The song titles are emphasized, but there's no way to select the artist. It seems like if I search for "zappa," I should be able to select the "Frank Zappa" Artist and see all of his albums (much like the way the Albums tab works in search: only show albums that have the word "zappa" in them).