Context: The first regular broadcasts started on January 1, 2004 when the Belgian company Euro1080 launched the HD1 channel with the traditional Vienna New Year's Concert. Test transmissions had been active since the IBC exhibition in September 2003, but the New Year's Day broadcast marked the official launch of the HD1 channel, and the official start of direct-to-home HDTV in Europe.

Question: When did regular broadcasts start in Europe?
Answer: January 1, 2004

Question: What event was first broadcasted on January 1, 2004?
Answer: Vienna New Year's Concert

Question: The New Year's Day broadcast officially launched which channel?
Answer: HD1

Question: When did test transmissions of HDTV begin in Europe?
Answer: September 2003

Question: Which European company launched HD1?
Answer: Euro1080

Question: When did non-regular broadcasts start in Europe?
Answer: Unanswerable

Question:  What event was first broadcasted on March 1, 2004?
Answer: Unanswerable

Question:  The New Year's Day broadcast officially did not launch which channel?
Answer: Unanswerable

Question:  When did test transmissions of SDTV begin in Europe?
Answer: Unanswerable

Question: Which European company launched SD1?
Answer: Unanswerable