Facebook vs Google vs Microsoft vs Twitter - staff 'sing-off' in Techapella

Attracting the likes of Google, LinkedIn and Microsoft, the third annual Techapella concert was held in Redwood City, California.

The concert brings together all the major companies in Silicon Valley, pitting them against each other in a fierce battle of vocals. The performance, which was free for members of the public, was a chance to set aside the fierce rivalries and bitter competition prevalent in their industry, and celebrate something together.

Laolee Xiong, a founding member of Facebook's group, The Vocal Network, said in an interview with Business Insider: “We know [singing] isn't part of our job, but it's more or less an extracurricular activity. We're more than software developers and engineers — we love to sing, too.”