 
 <prompt> Wetin dem dey attribute the reduction for bitrate to? Based on the previous question, write a context wey contain the answer. E fit be 1 - 20 sentences. Context: <response>: Further work on MPEG audio finish for 1994 as part of the second suite of MPEG standards, MPEG-2, wey dem formally know as international standard ISO/IEC 13818-3 (a.k.a. MPEG-2 Part 3 or backwards compatible MPEG-2 Audio or MPEG-2 Audio BC), wey dem first publish for 1995. MPEG-2 Part 3 (ISO/IEC 13818-3) define additional bit rates and sample rates for MPEG-1 Audio Layer I, II and III. The new sampling rates na exactly half of wetin dem originally define for MPEG-1 Audio. This reduction in sampling rate dey help cut the available frequency fidelity by half while also cutting the bitrate by 50%. MPEG-2 Part 3 also improve MPEG-1 audio by allowing the coding of audio programs with more than two channels, up to 5.1 multichannel. 