such as This Bird Has Flown and Rubber Folk. Writing in December 2015, Ilan Mochari of Inc. magazine commented on the unusual aspect of a pop album's 50th anniversary being celebrated, and added: "Over the next several years, you can bet you'll read about the 50th anniversary of many other albums – thematic volumes composed by bands or songwriters in the tradition Rubber Soul established. All of which is to say: Rubber Soul, the Beatles' sixth studio album, was the record that launched a thousand ships." Compact disc reissues Rubber Soul was first released on compact disc on 30 April 1987, with the fourteen-song UK track line-up now the international standard. As with Help!, the album featured a contemporary stereo digital remix prepared by George Martin. Martin had expressed concern to EMI over the original 1965 stereo mix, claiming it sounded "very woolly, and not at all what I thought should be a good issue". He went back to the original four-track tapes and remixed them for stereo. A newly remastered version of Rubber Soul, again using the 1987 Martin remix, was released worldwide as part of the reissue of the entire Beatles catalogue on 9 September 2009. The album was available both as an individual CD release and as part of the Beatles (The Original Studio Recordings) box set. The accompanying Beatles in Mono box set contained two versions of the album: the original mono mix and the 1965 stereo mix. The Capitol version was relaunched in 2006, for the Capitol Albums, Volume 2 box set, using original mixes of the Capitol album, and then in 2014, individually and on the box set The U.S. Albums. Track listing In all markets except North America Original North American release Personnel According to Mark Lewisohn and Ian MacDonald, except where noted: The Beatles John Lennon – lead, harmony and backing vocals; rhythm, acoustic and lead guitars; organ on "Think for Yourself"; tambourine Paul McCartney – lead, harmony and backing vocals; bass, acoustic and lead guitars; piano; maracas George Harrison – lead, harmony and backing vocals; lead, rhythm and acoustic guitars; sitar on "Norwegian Wood"; maracas, tambourine Ringo Starr – drums, tambourine, maracas, cowbell, bells, cymbals; Hammond organ on "I'm Looking Through You"; lead vocals on "What Goes On" Production and additional personnel George Martin – production, mixing; piano on "In My Life", harmonium on "The Word" and "If I Needed Someone"