The second series is probably the worst out of all 5 (not that ity is bad, but its more there to lay the foundations for future series!), so if you are still enjoying it then thats a good sign. Series 3 is my favourite, and episode 11 from that is stunning
Go and give Joanna Newsom's "Ys" and NMH's "In the Aeroplane Over the Sea" a listen. Not to everyone's tastes, but they're two of my favourite albums (and plenty of people will agree with me too), think you may love them (though don't hold me to that).