Here are 18 messages from the future or the past, delivered by Isaac Asimov, Charlie Stross, Adam Roberts and Gene Wolf among others.

Intrepid chrononauts Ann and Jeff VanderMeer have scoured time itself to bring you this final instalment from their über-guide to exploring the fourth dimension, THE TIME TRAVELLER''S ALMANAC. Be warned: reality will be warped, wormholes opened, paradoxes woven and parallel universes breached.

Just as well then that within these pages you''ll also find Jason Heller''s Music for Time Travellers (including playlist!)...