by William RuhlmannNat King Cole scored a number 12 hit in February 1952 with the ballad "Unforgettable," and Capitol Records celebrated by issuing his first compilation album in the LP format, that is, the 10" LP format, with room for eight songs. In addition to "Unforgettable," these included four other chart singles: "(I Love You) For Sentimental Reasons" (number one, 1946), "Mona Lisa" (number one, 1950), "Too Young" (number one, 1951), and "Red Sails in the Sunset" (number 24, 1951), plus a B-side ("Lost April"), a non-chart single ("A Portrait of Jennie," 1950), and an old standard (Irving Berlin's "What'll I Do?"). The disc thus didn't quite qualify as a complete set of Cole's biggest hits as of 1952 (in particular, it was missing "Nature Boy"), but with three chart-toppers and one of his real signature songs in the title track it was arguably a strong collection.[In 1955, with the 12" LP supplanting the 10" format as the popular size for an album, Capitol issued a beefed-up version of Unforgettable by adding two songs to either side of the disc. "Answer Me, My Love" (number six, 1954) and "Hajji Baba (Persian Lament)" (number 14, 1954) were appended onto the end of Side One, and "Pretend" (number two, 1953) and "Make Her Mine" (number 19, 1954) went onto the end of Side Two. This made the album even more of a hits collection, if still incomplete due to Cole's numerous chart successes.]