Singing is the art of producing musical sounds with the voice and augments regular speech by the use of sustained tonality, rhythm, and the most important thing, a variety of vocal techniques. Sure the one who listens to songs are known as the listener (Song listeners) but the one who sings the songs are called singer or vocalist as well.
If you are the one who is interested to learn singing but due to busy schedule can't join any Musical Training Institute or center then don't be sad I have best alternative for you.
As World is moving toward digital so you can learn music online as well, There are lots of music training Sites / Teachers available.
You can Learn Music On Youtube or you get paid skype classes as well
If want to know about more sources to Learn Music then I suggest you to go check out singing-Life Blog.
Singing Life was the one of most helpful source for me to learn music when I was struggling to learn hope you are going to get advantage from it as well.
Best of Luck
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