I wondered the same and wanted to know it too. Thanks for the post

Unless you have Shuffle enabled the files will be played in the order you add them to the Now Playing. So if you play a Playlist it should play in order of the Playlist.

When I create a playlist of songs from different CD's,
how can I make sure that they are played in the order
that I select and send them to the playlist and not
just from the same albums that they come from?