The music video for “I Will Glam” by Pedro Marín is the first one ever that you can view on teletext. Actually you can only see it on channel four in Spain, between May 18th and May 29th between 21.00 and 23.00, on page 899. Great Works are the creatives behind this. You can find some more background information here.
By the way, I turned off the volume very quickly after the video started, just to warn you.