September 17, 2012 Titanium – Aaron & Astrid In this a cappella cover version of Titanium, Astrid provides the lead vocals, with Aaron doing all the of the accompaniment. The original by David Guetta featuring Sia: Share this:TwitterFacebookLike this:Like Loading... Related Posted by thx42 in A cappella, Duet Tagged: aaron & astrid, david guetta, sia, titanium