Found this amazing web site for those of you who wish to listen to devotional songs online. If you wish, you can buy the songs as well.
You can listen to Kannada Devotional Songs at the below link, there are hundreds of selections.
If you like to listen to Kannada Bhavageethegalu, there is a wide variety there as well.
If you like to listen to Dr.Rajkumar, below is the link.
If you like to listen to Sri Vidyabhushana, below is the link.