Piano concertos by Wolfgang Amadeus Mozart it was probably J.C. Bach, whom Mozart admired, who introduced the structural innovation of allowing the keyboard to introduce new thematic material in its first entry. Concertos Nos 1–4 (K. 37, 39, 40 and 41) are orchestral and keyboard arrangements of sonata movements by other composers. The next three concertos (K. 107/1, 2 and 3), which are not numbered, are arrangements of piano sonatas by J.C. Bach (Op 5. Nos. 2, 3, and 4, all composed by 1766). Based on handwriting analysis of the autographs they are believed to date from 1771–72. Concerto No. 5, K. 175 from 1773 was
RBB Brandenburg RBB Brandenburg RBB Brandenburg (until May 2003 ORB-Fernsehen) was the "third television channel" for Brandenburg, Germany from January 1992 to March 2004. Until May 2003, it was organized by Ostdeutscher Rundfunk Brandenburg (ORB), then by its successor, Rundfunk Berlin-Brandenburg (RBB). On 1 March 2004, the two regional television channels of RBB - "RBB Brandenburg" and "RBB Berlin" - were integrated into the new rbb Fernsehen. The programme was launched on 1 January 1992 under the name "Fernsehen Brandenburg". In the initial build-up phase, the then ARD cultural television programme Eins Plus was taken over from 3 p.m. to 5.15 p.m.