Also, check with the Mac people, either at the website or some other official Mac source, to see what the terms of agreement for use of the Garageband jingles in personal VS commercial production. It is likely restricted, as Wolfgang says, and will require additional licensing.
If the jingle(s) are from THE garage band for whom you’re doing the website video commercial or promo, and they wrote and performed the original material, and give you a signed release to use their creative property on their website, shouldn’t be a problem.
