Pet Shop Boys don’t like to look backwards, but Graham and Chris are more than happy to do it on their behalf. Season three kicks off by marking 40 years of PSB recordings with a forensic examination of the catalogue, in a quest to spot those key tracks which helped propel them forward. From Please to Nonetheless, In Depth makes the case for 15 songs which signposted where Neil and Chris would venture next. But - quiz alert - how often do Pet Shop Boys’ album titles crop up in their song lyrics?

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