Riddle

My first is in bath but not in shower;
my second in strength, and also in power.
My third is in sister and also in brother;
my fourth is in father but never in mother.
My fifth is in short and also in tall;
my sixth is in shout but never in call.
My whole can be found in the land of the living.
though not in the dead, for its gift is life-giving;
stirs music to being, yet can kill a flame;
you have all your clues now, so what is my name?