There are many subtle nuances that go into songwriting. Lyrics, chords, instruments, etc. It takes a lot of work to make a truly musically sound song. By musically sound I mean this: are all instruments in tune to each other? (A given, generally) Does it sound full or thin? (By full I mean do all the instruments pull together with full musical tonality) For example, a song with just guitar and drums is missing something. It would sound much better if you threw in bass, maybe keyboards, or maybe some other stuff. Is every instrument and track at the same volume, or if not is the volume difference clearly intentional? There are many other things that make a song musically sound.

In my opinion, the most musical song I know is November Rain by Guns n Roses. There's two guitars, piano, keyboard, bass, drums, there's a horn in there somewhere, vocals (duh) and what is amazing is that they are all in harmony with each other.

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