You can never tell where you end up working (like maybe on the Beach here) if you are a music writer or just have an interest in music. For those occasions Yamaha has developed a concept solution, the Keyboard in a notebook. It consists of a notebook page to write the music and a small keyboard to help compose the music, all in a handy notebook form. There is no mention of headphones for private use, but it would seem that would be a welcome addition for crowded places.
Aloha from the beach,
greg