Having introduced 5 chord shapes for DADGAD tuning, let's turn our attention to open D (aka D A D F# A D). As with DADGAD, drop the sixth string down a tone to D, then drop the first and second ...

Tool’s guitarist Adam Jones is a long-time fan of drop D tuning. This allows him to get weight into his phrases while establishing a tight, identifiable tonality that sits alongside the bass.