Sennheiser has announced a Sound Logo contest:

What does Sennheiser sound like? We are looking for a Sennheiser sound logo – a short, acoustic signature tune.

Musicians, composers sound designers and creative minds of all kinds are invited to take part, between now and July 17, 2008. And the best ideas will be rewarded with some top-class prizes.

You can enter up to five times. Prizes range from nice headphones to 5,000 euros.