This one is a cover of Led Zeppelin's Stairway to Heaven, a song I love. I haven't been able to find out who the performers are but the video was released by SWR1 Hitparade.
This is another release by SWR1. This one is a cover of Queen's Bohemian Rhapsody. Here's the original.
This one came up twice in my Facebook newsfeed today. It's a selection from Les Miserables performed by the State Opera of South Australia.
And this haka was a performance by the team of 50 men chosen to perform at the Opening Ceremony of the Rugby World Cup. They performed flash mobs of this haka a number of times.