Currently Being ModeratedDec 25, 2012 12:00 PM (in response to douglaskbell)
You could define the "intro" part as an arrangement region and the "body" part as a second arrangement region. This will enable you to duplicate the "body" arrangement region several times to loop it; see: GarageBand '11: Edit arrangement regions
LéonieOS X Mountain Lion, 2.4 GHz I.Core i7, 16GB, 500GB SSD
Currently Being ModeratedDec 25, 2012 10:33 PM (in response to douglaskbell)
I would proceed like Leonie said because you always want a finite number of repeats. Alternatively, if you define the yellow region as the "body" of your song, hit play and then manually set the playhead to the beginning (by clicking into the ruler), the song will play from the start and then be caught in the loop forever once it reaches it.