Tangerine Dream - Ricochet (1975)

The first Tangerine Dream album that I bought and heard also happens to be the only TD album I can listen to from start to end. Recorded live in France and the UK and featuring the classic lineup of Peter Baumann, Chris Franke and Edgar Froese, the two parts of 'Richocet' (one on each side of the LP and lasting more than 17 minutes) constitute space-synth music at its most sublime. This kind of stuff can only be created with massive banks of modular analogue sythesizers and sequencers.

If you prefer TD's symphonic side to their more commercial electro-rock, this is what you should fill your ears with.