For me I cant choose other than Portishead and Beth Gibbons. I love the lyrics, the way she sings, and strength she put on words.
This last/first solo album its a must, and more I ear more I can see subtil sounds and words.
My favorite song its Rewind:
"Now that we have had our fun
Time to recognize the damage done
Feeling the fall of the beautiful
Opened our eyes and it's begun"