Combining 2 songs

I am very new to audacity. I am trying to put music to a powerpoint slide show and have 2 songs that I need to combine into one file so they will continuously play during the slide show. I will also need them to loop as the slide show may be a little longer than my 2 songs. Can anyone help me do this?

This tutorial may help: http://manual.audacityteam.org/o/man/tutorial_editing_an_existing_file.html

Some more links:

http://manual.audacityteam.org/o/man/faq_editing.html#join
http://manual.audacityteam.org/o/man/tutorial_looping.html .

Gale