Yes. The set actually starts with 2 Webb records from 1929 and then 3 from 31, before moving to the Decca period in 1934. There are 8 Decca tracks, before Ella Fitzgerald joined in 1935. Also, Chick Webb died in June of 1939, so the rest of the box covers the period where she lead the band until 1941. And, the set does meet Mosaic's high standards.