user: Question: what is the highest matrix when the recording date is 1926/03?
Columns: ['Matrix', 'Recording date', 'Title', 'Accompaniment', 'Paramount Issue No.', 'Sandra Lieb Classification', 'JSP 77933', 'Document DOCD']
Types: ['real', 'text', 'text', 'text', 'real', 'text', 'text', 'real']
Sample row: [1596.0, '1923/12', 'Bad Luck Blues', 'Lovie Austin Blues Serenaders', 12081.0, 'Twelve-Bar Blues', 'A', 5581.0]
SQL:

assistant: SELECT MAX("Matrix") FROM "Table" WHERE "Recording date" = '1926/03';