My guesses on the 5 songs would be 5 of the below:
Less Talk More Rokk
Livin' On A Prayer
Carry On Wayward Son
Basically the most well-known songs. If Still Alive isn't one of the five, that means you actually get 6 free songs!!! Yeah!!
the good thing about this is that add-ons will work with it like new songs and suchYeah.. but you buy that songs :\
there is one song that free.
New songs will only unlock in tour mode if you have the full version of the game. The Lite version only has 5 songs period.