You can customize the way you view and play your iTunes content.
The MiniPlayer takes up very little space on your screen, and still lets you adjust the volume, search for songs, choose which songs play next, and more.
The MiniPlayer displays the album artwork for the song that’s playing. When you move the pointer over the artwork, controls and song information appear.

You can also shrink the MiniPlayer to an even smaller size.

Open the MiniPlayer: Choose Window > Switch to MiniPlayer.
View and edit a list of upcoming songs: Click the Up Next button
.
Keep the MiniPlayer in the foreground on your desktop: Choose iTunes > Preferences, click Advanced, and select “Keep MiniPlayer on top of all other windows.”
Shrink to the smaller MiniPlayer: Click
near the top-left corner. To expand back to the full MiniPlayer, click
again.
To enter full-screen view, click the green button at the top-left corner of the iTunes window.
If you’re using OS X Mavericks v10.9 or earlier, click the arrows
at the top-right corner of the iTunes window.
To exit full-screen view, move the pointer to the top of the screen and click the arrows
at the top-right corner.
To quickly drill down into your music library and find a song, you can use the column browser.

Your music is sorted by up to five categories (Genres, Composers, Groupings, Artists, and Albums), divided into columns. As you select an item in each column, the list narrows down to display only the matching songs.
For example, to find only music by Mozart, you could select Classical in the Genres column, then Mozart in the Composers column.
Click
near the top left of the iTunes window, then choose Music from the pop-up menu.
Click My Music.

Select Songs from the sidebar on the left.
Choose View > Column Browser > Show Column Browser, and choose the columns you want to display. You can’t change the order of the columns.
To use the column browser, select options in as many columns as you’d like.
As you select options, songs that match your selections are displayed below.
To close the column browser, choose View > Column Browser > Hide Column Browser.
By default, the sidebar is visible. You can hide it.
Choose View > Hide Sidebar or View > Show Sidebar.
Note: You can’t access your playlists when the sidebar is hidden.