Answer:
I cannot be felt, seen or touched; Yet I can be found in everybody; My existence is always in debate; Yet there is a style of music named after me.
One am I, among six others: Largest, smallest, cold, dark and two brothers
I always run but never walk, I sometimes sing but cannot talk, No head on which a hat to place, You always look me in the face.
He's small but he can climb a tower.
Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.