Which is the most beautiful song written so far?

There has been written a lot of beautiful music over the centuries. Everything from classical, folk music, opera, ballet, pop, rock'n roll, R & B, film music and I can go on and on...... what are some of the songs and music pieces you consider to be among all this beautiful songs or are they still yet to be written?
Which is your favorite song or music piece in your opinion?

Here are a few in my opinion;

"Wiosna" by Chopin, "Canon in D" by Pachelbel, "The Spinning Song" by Elmenreich, "Jessica's Theme" (breaking inthe colt) from The man from the snowy river by Rowland, "Sonatina in C" by Clementi, "Cavatina" from "The Deer Hunter" by Myers, "The Entertainer" by Scott Joplin, all the music of ABBA, The Rose by Mc Broom which Bette Middler sings, Love changes everything by D.Black/ C. Hart.......

The album Rattle and Hum by U2 is said to be one of their best once they have ever made. It's a great album with lots of nice songs such as "I still haven't found what I'm looking for", "When love comes to town", "Love rescue me" and "All I want is you". Another song by U2 is the "Mysterious ways" from the album Achtung Baby