we'll be pecking lightly, like a woodpecker with a headache

It's probably no big surprise, but I'm something of a fan of the 1970's. It would be nearly imposible to name my favourite decade, but it would definitely be a toss-up between the 60's and the 70's. I also love records. Therefore, it makes sense to list (as I love to do), my top 5 favourite records from each decade. Chronologically, I should start with the 60's. But, fuck that.
Here's my top 5 favourite albums from the 70's:

Marvin Gaye - Let's Get It On
My absolute favourite record from the 1970's, and one of my favourite records of all time. I usually listen to at least one side of it everyday, and I have for almost a year. Nothing makes me feel so warm, good and content as when I touch the needle down on this record.
Favourite track: "Come Get To This", very possibly my favourite song ever, it sets my soul on fire in just under 3 minutes

Funkadelic - One Nation Under a Groove
This record - and it was hard to pick from my many Parliament-Funkadelic records - is so amazing because it shows the talent, wit and versatility of Funkadelic. From a satirical, tripped out semi-ballad (the supernasty "Promentalshitbackwashpsychosis Enema Squad") to proving a funk band can play rock ("Who Say a Funk Band Can't Play Rock!?") I know there will be a different answer for any funk fan you ask, but if you have to own one P-Funk record, I'd say make it this.
Favourite track: "One Nation Under a Groove" gives me more of what I'm funking for

Led Zeppelin - Led Zeppelin III
This album needs no introduction.
Favourite track: "Since I've Been Loving You"
Black Sabbath - Black Sabbath
My love for Black Sabbath is still in its nascent stages, but I cannot get enough of this album. This is early Black Sabbath and, quite frankly, it is amazing. I personally had a warped view of Black Sabbath for most of my life, and they are much different than I had imagined. If you're a Led Zeppelin fan, do yourself a favour and check out this album.
Favourite track: "The Warning"
Parliament - Funkentelechy vs. the Placebo Syndrome
This is a party on vinyl. I have never listened to a single song from this album without dancing around, urged on my the purest of joy in my heart. Of all the concept albums, this one sticks to the concept the hardest: Starchild and his Funkentelechy battles Sir Nose D'voidoffunk, purveyor of the dreaded Placebo Syndrome. But even if you hardly pay attention to the lyrics (and you'll be missing out), the grooves alone will make this album the soul of any good time to be had.
Favourite track: "Funkentelechy", using satirical references to advertising slogans to remind you that "there is nothing that the proper attitude won't render funkable"