Here are some old instrumental albums I've been using as a writing soundtrack recently.
They're all pretty much of an era and style, and they're scuzzy YouTube rips, but if you need something for your (un)conscious mind to surfboard on, dive in.
There's one that's not featured below, and that's B12's Electro Soma (band pictured above). It's non-embeddable, but you can click through to it here.
Go listen. Then buy the albums because they're right cracking, they are.