National Public Radio (NPR) has some fantastic online features, and one of the jewels in the crown is the NPR Music/Concerts section. There is a wide variety of musical genres represented including rock, pop, folk, dance, jazz, blues, classical, opera and world music.
The concerts are free and can be listened to streaming online and are also available as podcasts. Each full length concert even includes a useful set list.
As well as concerts you can also find and archive of recorded studio sessions.
Content is updated consistently so there is always something new to look forward to and enjoy!