I think Tsunku is trying to create versions of the songs that can attract the younger audience. I think Tsunku wants to make these songs reflect the new Morning Musume and you can't do that by just adding new vocals to the old songs. My hope is when 24 hr TV wants Morning Musume to do Love Machine they can play the updated version. And whenever anyone wants them to do Renai Revolution and/or the Peace they can do the updated version as well. That way the group can still play the old songs, but have their new fresh identity attached to them and people can watch them and think oh this is Morning Musume and not have the associations of the past group. (So people don't say who are these girls singing this Morning Musume song?) Everyone who said its like Karaoke has a point. And AyuHikaru is right... you can always listen to the old songs. Maybe someone can take the new vocals and place them over the old instrumental for you guys