For anyone interested in the American charts but put off by the high cost of Billboard magazine (cover price currently £5.50) it is currently possible to take out an annual subscription to the digital version for £49.30 - that works out at just under £1 per issue- via www.zinio.com

BTW just to clarify - the magazine can't be downloaded as a PDF - It can either be read online or offline in the website's own reader app!