Too many to list!
But for a real genuine keeper, it would be 'Moonflower' by Santana.
Their last great album, but more importantly the album that took me onto so many new pastures. In 1990, I was a 16 year old metal fan, but slowly moving away from it. I heard a whole side of 'Moonflower' played by Fluff Freeman on a Saturday night, and I was hooked.
I can't think of many records that have so much - soul, pop, rock, latin, jazz, funk......it took me to a million new directions which I still explore today - and for that its a special one for me, 24 years in. I became immersed in totally new music overnight.
Many come and go, but I still love it. Listened to it last weekend in fact.