Here are the tunings most used by Nic in the time before his accident.

G major D G D G B D

C major C G C G C C

G minor D G D G Bb D

C minor C G C G C Eb

G modal D G C G C D

C modal C G C G C D

He also used D A D G A D, which is very popular with Irish musicians today


I will search more completely tomorrow as to the specific songs you ask about.