I'm having a similar issue. This might just be a iTunes catch-up that they need to make with Spotify. One of my favourite features of Spotify was the ability to click on a song from the radio or a pre-made playlist as it was playing and add it to my own playlists. I can't seem to do this in iTunes. I've left and right clicked on pretty much every inch of iTunes in complete frustration trying to find a simple "Add to playlist..." function... and this incredibly intuitive function is simply non-existent on iTunes. There should also be a "Go to Artist", "Go to Album", etc functions available in the same dropdown. If iTunes doesn't improve by the time my three-month free service is up, I'll be going back to Spotify.