Adding music to a playlist

There are two main ways to add music to a playlist:

You can drag and drop discs, tracks, and MP3 files from the Library window into the playlist. You can also drag and drop playlist files from Explorer into the playlist. In all cases, the new music is inserted at the point your dropped it.
Right clicking on music in the Library window allows you to add it to the end of the playlist without using drag-and-drop.