Simplify the following text for a Grade 7 native English-speaking person.
Original: In 1928 Basie was in Tulsa and heard Walter Page and his Famous Blue Devils , one of the first big bands , which featured Jimmy Rushing on vocals .
Simplified: In 1928 Basie was in Tulsa and heard Walter Page and his Famous Blue Devils , one of the first big bands , which had Jimmy Rushing singing .