Called The Guinness Book of Records, this is a site that represents an organization that for years has recorded events and stunts from all over the world. The desire of human beings to be the fastest, or tallest, or have that smallest or largest of an item are the bread and butter of this group. At this site, you can find out about the latest record setting attempts and in what categories, search for existing records, find out the schedule of their television show, and suggest ideas for new categories or records.
This site is really interesting, one that you can spend an hour or two and be thoroughly entertained. By the way, the longest song title is a 1946 song by Hoagy Carmichael called “I’m a Cranky Old Yank in a Clanky Old Tank on the Streets of Yokohama with my Honolulu Mama Doing Those Beat-o, Beat-o, Flat on my Seat-o Hirohito Blues”. Or it was the last time I looked. As for the other answers, you can find those for yourself at the site.