Mountain City by Second Hand Wings (see
http://www.lfest.co.uk/second-hand-wings/) is pretty good.
Astroid Boys' A48 Blues is rather magnificent. The purists out there will say that, strictly speaking, a UK trunk road is not a hill. But the A48 does pass many hills - and what the hell, the band is so great that they had to have a mention.
Oyster Band got a mention above I think? - but not their song "One Green Hill".
Whereas David Gray couldn't tell the bottle from the mountain top.
But my favourite hill-related song, the one that goes through my head when walking, has to be the Lemonheads.
Always had a roof above me
Always paid the rent
But I've never set foot inside a tent
Can't build a fire to save my life
I lied about being the outdoor type
I've never slept out underneath the stars,
The closest that I came to that was one time my car
Broke down for an hour in the suburbs at night
I lied about being the outdoor type
Too scared to let you know
You knew what you were looking for
I lied until I fit the bill
God bless the great indoors
I lied about being the outdoor type
I've never owned a sleeping bag, let alone a mountain bike
I can't go away with you on a rock climbing weekend
What if something's on TV and its never shown again?
It's just as well I'm not invited - I'm afraid of heights
I lied about being the outdoor type