Add a song to playlist option when your travelling? I carry hundreds of songs on my iphone and I dont know half the names or artist.

It would work like this -

In settings you would have an option to turn voice control on/off when off and using the headphones when you press play for say 3 sec the song currently playing would be added to the default playlist, and would create one if needed.

Also an add to playlist button on the main music player screen, the current method is slow and too many steps are needed to add a song.