I am a Guitar teacher. Went back teaching about 8 years ago and Decided teaching and learning should be fun. Of course I teach all the different Keys and The basic chords in that key. As we go along the students obviously want to learn the songs that THEY like not the Ones I like. So I do that for them. Some of them are advanced now and I am teaching them to pick out keys of songs by ear. They love this too. So I agree with a lot of comments on this site. Music should be FUN !!!!