Apple has offered members of its .Mac service a generous sampling of 'World Music Sampler' GarageBand Jam Pack loops. These loops are immediately available for download free of charge to all .Mac members.

Verbatim from the .Mac blog:
You might be a virtuoso, or just an air

guitar prodigy. Either way, GarageBand lets you create, perform, and record your own music, by putting you in control of your own professional recording studio with hundreds of instruments. Add a GarageBand Jam Pack, and it's like having a vast pool of session musicians and a record producer at your disposal.

And right now, you have the exclusive opportunity to find out for yourself what a difference Jam Pack can make. Because .Mac members can download a free sampling of 400 Jam Pack loops - 100 loops each from the all-new World Music Jam Pack, along with Symphony Orchestra, Remix Tools, and Rhythm Section. Use them to build a foundation for your solos, or create an entire composition of your own. You can also add loops to your pod casts and even score a musical soundtrack for your iMovie or iDVD project.

400 free GarageBand Jam Pack loops. You've got to like the sound of that.