Last.fm, the online music service now owned by CBS, recently invited its users to east London for a day of free food, drink and a spot of work.

This so-called “hack day” or “unconference” gathered together tech enthusiasts to compete to develop a new application for Last.fm . One developed an application that notified users when their favourite band was playing in their area. But it was “StaffWars” – a program that settles disputes about who should control the office stereo with a short music quiz – that walked away with the £1,000 ($1,440, €1,120) prize.