Happy birthday
The song "Happy Birthday" is recognized as the most-recognized song in the English language according to the Guinness World Records.
Brenda Song speak English and Korean and she is bilingual.
The song "Gypsy" sang by Shakira is in English and Spanish
The song is in English, but she has a heavy Romanian accent. 
yes
She speaks English,Chinese,Korean and Vienamese
a song sung in the Swedish language, "Caramelldansen" is "The caramel dance" in English
The entire opera "Madama Butterfly" was written in Italian, and is most commonly performed in that language, although translations into other languages, including English, are also performed.
There is no actual English-language version of it. However, there is an English-language song that used the melody of "Pour que tu m'aimes encore." That song, "If That's What It Takes," can be found on her 1996 album Falling Into You.
It's sung in English with Caribbean accent
Her first English-language song was "Listen to the Magic Man," an English version of "Dans la main d'un magicien," from the soundtrack to The Peanut Butter Solution.
It seems that most of the people of Earth have decided to learn English as their second or first language. Thus most people on Earth can speak and or understand English. When you make a song for publication, you do so with the intention of making money from it by selling it as widely as possible. Making it in English is therefore the best strategy as this makes it available (understood by) the most people on Earth.