7th riddle, answer: Music!
You can't see me with your eyes, yet you know I exist. --> You can't see music, but you can hear it!
I can be accompagnied by time, room or record. --> words that can accompany music, music room, music time, music record, etc.
Most people usually like me or at least one of my kind." --> who doesnt like at least 1 kind of music?
Only 2 winners this time, 500k each!!
Alexander (IGN Alexander) --> First winner
Tenshi (IGN Black K. Night)