Standard american english
The most widely understood English dialect
contumacy - stubborn, persistent disobedience to authority. (Note that the word is not widely used or widely understood in English and may appear pompous to many).
In order to communicate effectively, one needs a language that is widely understood and is common. Over the years, English has become that sort of language. It is the language most commonly used and understood by almost everyone. So it is easier to communicate in English as it is the best way to express ourselves. In the present age, it has become even more of a medium of communication because it is the language of the Internet and the computer. And as most of the communication these days involves computers and internet, so it is even more widely used.
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.
Vernacular, dialect or local jargon.
The most widely understood English dialect
Egyptian
Mandarin is the most widely used Chinese dialect.
Cantonese dialect is the second most widely used language in China.
The common language of Shanghai is Shanghainese, which is a dialect of Wu. Mandarin is also widely spoken.Mandarin and Shanghainese are not mutually intelligible.
If by "first" you meen the most widely spoken/understood, then that would have to be English.
Bhojpuri , a dialect of Hindi is widely spoken, . Hindi,Urdu is also spoken in some urban population. English is also widely understood in Urban area. Provided by..Delhi Public Convent School Team,Baheri,Ballia,UP,India
German is the only official language of Liechtenstein, and the most widely spoken dialect is Alemannic.
Cantonese is the second most widely spoken language/dialect in China.Form more information about the 296 languages of China, click here.
The most widely spoken languages in Modena areItalianModeneseModenese is a dialect of the Emilian-Romagnol language.Albanian and Romanian are also spoken.
Pakistan. Urdu is a close dialect of Hindi.
The official language in China is Mandarin, and the most common dialect is the Beijing dialect.