Something you’ll find a lot of on YouTube is videos of people playing along to K-On! songs with their instruments – some successfully, others less so. One who has caught the attention of many K-On! fans is the (currently) 14 year old drummer Senri Kawaguchi, who has done numerous such recordings. Her K-On! covers aren’t necessarily her most impressive performance (check out this video from when she was nine years old!) but hey, this is a K-On! fan blog.
These three videos were all done back in 2009, not too long after the anime first started.