Okay – I’m not going to keep bringing this up all the time, but yes; this is about the music replacement again. As mentioned in the Volume 1 Blu-Ray review/comparison, Bandai’s US release of K-On! has music replaced in the first episode. For some, it may not seem like a big deal. For others, it’s a huge disappointment. Personally, I think that with K-On! being a heavily music-themed anime, any music replacement is especially unfortunate.
For those who aren’t really sure what to make of this, here is a video that shows exactly what the change entails: