Riddle: I can fill a room with out being seen, for your eyes I do not need. I can be felt, but can never feel; can be heard, but can never hear. I have many thoughts, but never think. I say many things, but never speak. I can tell a story with no words. Through my waves I am heard. I am your life, your love and sad goodbye. I resound in your every laugh and cry. I mark time, and time marks me. The past, present and future, through me you'll see. What am I?