Help finding a plug-in/add-on for iTunes?

Recently, I had hard drive issues on my mac, and so I had to have it replaced. No biggie, I bought one of those hard drive enclosures, so now my old hard drive hooks up via usb and it’s basically an external hd.

Here’s the thing. On my original hd, I had some plug-in/add-on for iTunes that allowed me to use keyboard shortcuts to switch songs, play/pause, pull up playlists, all this stuff that I’m frustrated that I can’t do anymore.

The application, whatever it was, was one of those things you’d see in system preferences as one of the things that open automatically upon login. . . Whenever the song changed, a little overlay window would appear-gray, with artwork, title, artist, album, maybe even year?

So I was just wondering if you could answer one of two questions:

1. Do you know what plug in I’m talking about, or at least one similar for the mac? I just downloaded You Control Tunes but it doesn’t have the hotkeys function that I’ve grown so fond of.

2. Do you know where I could find the location of the plug in in Finder? I’ve been all over the library folders of my old hard drive, but I can’t seem time find anything that looks right. I can’t remember what this thing is called, but I have a feeling if I saw the name of it, it would look familiar, but I haven’t seen anything yet that does.

I would appreciate any help anyone could offer on the matter!

(tl;dr – I’m frustrated by lack of universal shortcuts in iTunes and would like to be able to skip/pause songs while in other applications)