I don't know her very much but this video is interesting
LSD - Thunderclouds (Official Video) ft. Sia, Diplo, Labrinth
And this Tune is GREAT
Sia - Chandelier - Live
Actually, I knew her songs indirectly !!!
Anyway if you can do 英会話 very much you could understand her songs very much and deeply !!!!
Keep on Rock guys
ciao