What is Billy best selling album?

The album "52nd Street" by Billy Joel is widely regarded as his best-selling album. Released in 1978, the album was a commercial success, selling over 7 million copies in the United States and peaking at number one on the Billboard 200 chart. It was also a critical success, with critics praising Joel's songwriting and musicianship. The album includes several of Joel's most popular hits, including "My Life," "Big Shot," and "Movin' Out (Anthony's Song)." "52nd Street" has been certified triple-platinum by the Recording Industry Association of America (RIAA) and is considered one of Joel's most influential and successful albums.