Isn't there some artiste who insists on a basket full of puppies? Sure I heard that somewhere...
IF you could get hold of them, (and you wont, as they typically have a P&C clause) there is a book to be written about Band 'Riders'.
Beyond the usual booze requests I've seen:
Michelin star restaurants.
Wooden toys
VERY expensive chocolates
Incredibly detailed menus, down to individual ingredients, per member of band/crew, for 4 meals a day, for a 30 day tour
Room specifications that even top hotels blanch at
Insistance of bypassing baggage and customs at airports
Ridiculous vehicle specifications
Overall its the top American Bands that were the worst, whilst the request may be on the outer edge of possible in the USA, it's not even conceivable in Europe as we simply don't have 1,000 sq meter suites with en-suite infinity pools, or the practicalities of travelling around Europe in a stretch limo, or wanting a back stage dressing room with certain facilities when playing a theatre that is older than their country, and if they are lucky they may get a sink. And no, you are a foreigner, so you can't just cross the border without waking up, getting out, showing the guy your passport and having your baggage riffled through.
And finally a letter from your mum, to the guys on passport control should not be enough to let you into the country (although that actually worked ....)