annette and inga humpe are german sister duo humpe & humpe. their best song/vid is yama-ha, i love the hairzstyles! and the yellow lips. the other songs and vids aren't as poppy but still quite magicalz. it would be so fun to be in a sister group, you could do such good coordinating outfits. i have three of the exact same acid wash mandarin collar/cutout back dresses for the day im in a girl group and we can perform in them.