FROM THE 'scientists with too much time on their hands' department:

Carrying a guitar can increase the chances of you getting a date by a third, according to a study by researchers from the University of South Brittany.

The study found that women were 31% more likely to give their number to a man carrying a guitar - double the amount of people who would give their number to the same man when he was empty-handed.

But this technique only works if your [sic] a man, women are not seen any more or less attractive if they carry a musical instrument.