"Rubber Soul" was commercially successful, beginning a 42-week run on the "Record Retailer" LPs chart (subsequently adopted as the UK Albums Chart) on 12 December 1965. The following week it replaced the "Sound of Music" soundtrack at the top of the chart, where it remained for eight weeks in total. On the national chart compiled by "Melody Maker", "Rubber Soul" entered at number 1 and held the position for thirteen weeks; it remained in the top ten until mid July 1966. In the United States, "Rubber Soul" topped the "Billboard" Top LPs chart on 8 January 1966, having sold 1.2 million copies there within nine days of release. These initial sales were unprecedented for an LP and were cited by "Billboard" magazine as evidence of a new market trend in the US in which pop albums started to match the numbers of singles sold. The album was number 1 for six weeks in total; it remained in the top twenty until the start of July, before leaving the chart in mid December. As the more popular of the joint A-sides, "We Can Work It Out" became the Beatles' sixth consecutive number 1 on the "Billboard" Hot 100 chart, all of which were achieved over a twelve-month period from January 1965.