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Here is an excellent video about RSS/Feeds and readers.
http://www.commoncraft.com/rss_plain_english

However, while adding a subscription in Google Reader, it is not mandatory to give the URL of the RSS/feed, but its enough to give the URL of the main site. For ex. you can give
http://shreyaswrite.blogspot.com while adding subscription in Google Reader instead of http://shreyaswrite.blogspot.com/feeds/posts/default.

RSS feeds are actually XML files in a standard format, so readers basically incorporate an XML parser and pull out the feeds.

Have you ever wanted to listen to famous kirthanais of Tyagaraja rendered by stalwarts like Madurai Mani Iyer, Maharajapuram Santhanam, Mandolin Srinivas etc.?
Visit:
http://surasa.net/music/tyagaraja-archive/