Amy Winehouse- Every song on Back To Black, I believe an american journalist said "when this lady sings about love, she means every word". Shame she is no longer with us- a great loss to music.
The Manic Street Preachers- very powerful lyrics about difficult issues, 'Suicide Is Painless' for example 'Motorcycle Emptiness' conveys materialism, consumerism and capitalism. They are no longer going either
Elbow- need I say more about Elbow- poetry