Kalevala: The National Epic of Finland

I consider the Finnish Literature Society website a good source that describes the Kalevala.  To understand it's significance, read this:
http://neba.finlit.fi/kalevala/index.php?m=163&l=2

To see the text in Finnish http://neba.finlit.fi/kalevala/index.php?m=1&s=2&l=1
To see the text in English http://www.gutenberg.org/ebooks/5186

Runos singers perform the Kalevala while playing a kantele :
http://www.temps.fi/en/research/


An excerpt from the Finnish Literature Society:

It has been estimated that approximately 2,500–3,000 years ago there occurred a major new development in the culture of the proto-Finnic groups living near Gulf of Finland. The result of this development was a unique form of song characterized by alliteration and parallelism as well as an absence of stanza structure. The poetic metre of these songs was a special trochaic tetrametre which is now often called Kalevala metre.  

When sung, the lines actually had four or five stresses, and the melodies covered a narrow range, usually consisting of only five notes. The old folk poetry does not originate from a single historical period, but is a mixture of numerous layers which vary in age. The oldest layers are represented by mythical poems which tell of creation acts in a primordial past, as well as the origins of the world and human culture. 

The main character in epic poems is usually a mighty singer, shaman, and sorcerer, the spiritual leader of his clan who makes journeys to the land of the dead in order to seek knowledge. The songs' heroes also have adventures in a distant land beyond the sea, on journeys where they woo potential brides, make raids, and flee the enemy. Lyric songs express human, personal emotions. Ritual poems focus especially on weddings and bear-killing feasts. Kalevala metre incantations are verbal magic, which was part of people's everyday lives and activities. 

The archaic song tradition was a vital, living tradition throughout Finland until the 1500s. Following the Reformation, the Lutheran Church forbade the singing of the songs, declaring the entire tradition to be pagan. At the same time, new musical trends from the West found a foothold in Finland. The old Kalevala metre song tradition began to disappear first from the western part of the country and then, later, from other areas as well. Some songs were recorded already in the 1600s, but most of the folk poetry collection work was not carried out until the 1800s. In Archangel Karelia the old poetry tradition has survived until the present day.