When You're Smiling - Jack Hylton And His Orchestra, HMV B. 5852, 1930
An absolute classic from the early 30's, later to be made famous by the many artists who recorded this. Photos of Jack and His Band from www.jackhylton.com - it's a great site, go take a look!
Recorded on 2nd June, 1930 at Small Queen's Hall, London