Commercial vs Non Commercial radio

When we are driving to work or school, we are given a lot of choices. We have a choice to listen to a cd, ipod or the radio. If we managed to choose the radio, we are given more choices. We then have to choose to either listen to am or fm radio. If we managed to choose one of the two, we then have to choose a radio station. As you can see we are given lots of choices. Though we have lots of choices to choose from, there is one decision that tends to be missed. It's the choice to listen to commerical or non commercial radio. What is the difference between the two?
There are several qualities that define a non commercial radio station. One quality that non commercial radio stations have is that it has a vast music library. Commerical radio stations contains far less songs than non commercial radio stations. It is said that if a listener were to listen to a song from a non commericial radio station, there is a good chance that the listener would never hear that song ever again. Their music library is that huge.
Another difference between the radio stations is the content of the music. Commercial radio stations tends to play popular mainstream music while non commericial radio stations will play underground and unknown music.
Also, another difference between the two stations is money. Commercial radio stations would play commercials so the station can make money from companies. Non commercial radio stations would never play commercials for profit. Instead, they would play public service annoucments that would help the local community.
Overall, I just want people to know that their is a difference between the two types of radio stations.
If anyone is interesting about hearing underground music, I suggest you listen to San Jose State's radio station, 90.5 KSJS. This non commercial station was voted as one of the best college radio stations in the country.

Here is their web site.

http://www.ksjs.org/