Trivia Why's by Trivia Why's Guy

A1) The Beatles. Paul McCartney's composition (with help from John Lennon) was released in 1968 from The White Album. Yoko Ono, Linda Eastman, and Patti Harrison all sang backup.
A2) Good Morning to All. Patty and Mildred Hill composed the tune for their school in Louisville, Kentucky in 1893.
A3) Preston Ware Orem. The original song and lyrics are now in the public domain, but Orem's version reset the copyright clock 42 years later.
A4) Summy-Birchard Music. But also give yourself credit for AOL Time Warner, which owns the company. Thanks to the Copyright Term Extension Act of 1998, the copyright isn't set to expire until 2030. Rumors that Paul McCartney owns the copyright are no more accurate than the ones that claimed he died in 1969 (not Michael Jackson either even though he snatched the rights to many Beatles songs McCartney coveted).
A5) The Sultan of Brunei. Hassanal Bolkiah (born July 15, although the party was two days earlier) was once estimated to be the richest person in the world.
A6) 45. Monroe performed her famous rendition in front of over 15,000 people in Madison Square Garden on May 19, 1962.
A7) Futurama. On Nibbler's birthday, Fry adds, "And you smell like one, too" from the monkey variation of the standard birthday song.
A8) 80th. You'll also get one every decade thereafter.
A9) 13th. Girls celebrate their Bat Mitzvah one year earlier (it's all about maturity).
A10) The one that matches the day you were born. I wish I'd known that a decade ago, because it would have been special as the oldest possible golden birthday (and within a year of my turning a billion seconds old).
A11) August. Just over nine percent (9.07%) of Americans were born in August, and 8.80% were born in July. February, with the fewest days, is dead last at about 7.55%.
A12) October 5 (New Year's Eve conception). May 22 is the least common (summer heat?).