Ok...
I recently discovered how each music player sounds different. You'll obviously need good headphones or speakers to notice the difference. Stereos have more bass response while the phonograph/record players are static-y. The hi-fi stereo in particular sounds the best in terms of sound quality.
Nice touch Nintendo!
Who else noticed this?
Lol, I also only discovered this only last week when I started using headphones.
My son bought himself very good yet inexpensive headphones and I asked for one. The sound quality is fantastic but was surprised at the different sounds and responses from the different music players!