White Christmas (song) are the formats and track listings of single releases of "White Christmas". Crosby's "White Christmas" single has been credited with selling 50 million copies, the most by any release and therefore it is the biggest-selling single worldwide of all time. The "Guinness Book of World Records" 2009 Edition lists the song as a 100-million seller, encompassing all versions of the song, including albums. Crosby's holiday collection "Merry Christmas" was first released as an LP in 1949, and has never been out of print since. There has been confusion and debate on whether Crosby's record is or is not the best-selling
What Is Life a combination that became the top-selling single of 1971 in that country. "What Is Life" is one of Harrison's most commercial and popular songs – a "spiritual guitar quest" that "became [a] classic", according to "Rolling Stone" magazine. On release, "Billboard" magazine's reviewer wrote of "What Is Life" and "Apple Scruffs" as "intriguing rhythm follows-ups" to Harrison's previous single, which were "sure to repeat that success" and "should prove big juke box items". In their "Solo Beatles Compendium", authors Chip Madinger and Mark Easter refer to it as an "intensely catchy track" and view its pairing with "My Sweet Lord"