Now That's What I Call Music XIII or Now 13 was released in 1988. The album is the 13th edition of the (UK) Now series. It was released on vinyl, audio cassette and CD formats. It reached number one on the UK Albums Chart for four weeks. This would be the last compilation album to be number 1 on the chart, as the UK Compilation Chart was created in January 1989 due to the dominance of compilations in the albums chart over the previous few years. Now 13 was the first number one album on the new chart.