If we look at Folk songs they are have a lot of melody and rhythm, there is a lot of natural dancing associated with Folk music and we feel the rhythm inside us and automatically start swaying to the beats of the music and its an wholesome experience altogether. The style of singing, the accompaniment and harmony all gel together to create that sound. When we watch professional singers from a certain culture, we see that they try to maintain the authenticity of their culture in the way they sound. We may find many sources to pick up songs written in books, but unless we listen to the music from that same culture we will have no idea of what that song should sound like. You can’t actually get that detail from just looking into the books or notes on a page unless you relate the song to the musical background.

http://vocalquick.com/strain

If we look into more details of singing which included a work of drama and music then an Opera is an art of form in which singers and musicians perform a dramatic work combining text and musical score, usually in a theatrical setting. It incorporates many elements of spoken theatre,such as acting ,scenery and costumes and sometimes includes dance too. The performance is typically given in an opera house, accompanied by an orchestra or smaller musical ensemble.

Although singers train to get a wide range they cannot be expected to sing any role in their voice strain range. Very often in opera the heroine is a soprano and the hero is a tenor. Basses may often have the part of a powerful king, or he may be the bad guy.

Most young singers, who want a future in opera begin lessons at age 13 or 14. This is the age when the vocal chords are developed enough to begin vocal training. But, for most singers, real opera training starts when they are in their 20s and beyond.