My personal ones are:

Those were the days of our lives - His goodbye to the fans
Prophets Song (A night at the opera album)
Hammer to Fall - Awesome live http://www.youtube.com/watch?v=5xInX_f3VoA
Bohemian Rhapsody - Nuff said
One by one (Only the good die young) - Played at Dad's funeral.
Princes of the Universe
Scandal
Delilah
Who wants to live forever
Radio Ga Ga

There are loads more.. Way too many to mention.. and yes, I am a bit of a fan lol