Head to the London Underground this Saturday (4 June) to join the hunt for 400 limited edition Tube maps hidden around the network.
Saturday marks the 114th anniversary of Harry Beck's birth; and Manchester's finest, The Charlatans have produced a 'Tune Map' to honour the occasion, and give fans some cool memorabilia to enjoy.
The tube lines represent The Charlatans' albums, the stops are tracks, and interchanges are songs which appear on more than one album.
And there's more: dotted lines show bonus tracks; aeroplanes symbols show songs on import albums; a line through a station / song indicates a 'hidden' track. (Ahh, for the heady days of non-digital music formats, when this stuff actually meant something...)
And the blue strip of river isn't in fact the Thames at all; it's a graphic marking the chart positions of the band's albums, from their number one debut Some Friendly in 1990 to recent Top 10 hit Modern Nature.
The Charlatans frontman Tim Burgess will be heading onto the tube and various other London locations connected to the band to hand out the limited edition maps and oyster card holders tomorrow (4 June). Follow Burgess on Twitter for clues as to his whereabouts during the day.
If you're a massive fan and determined to get your hands on a copy, you can by being one of the first 100 people through the doors at The Amersham Arms tomorrow night for Burgess' DJ set.