William retained the spelling “Leng” at least through his 1912 entry in the Boston city directory but thereafter used the surname "Lang."
As "Billy Lang" he entered the music business no later than 1910, and his employment probably dates from 1908.
[2] Thereafter he worked for Broadway Music Corp., becoming its business manager in 1920; he also engaged in several small publishing ventures with friends.
[3] He was well-liked in the business; a benefit for him, organised in Boston after a major illness in 1919, raised upwards of $1000.
[4] In the 1920s he was still in Boston, but by 1930 he had left the entertainment business and moved to Burlingame, California, where he opened a restaurant.