Replacement for live music audio streams. Whereas streaming a performance live over the Internet requires careful coordination of person and machine, podcasting offers the ability to do slight time-shifting of performances and greatly reduces the complexity of the effort. The quality of the program is often higher as post-production adjustments can be made prior to release. For example, programs can provide a live stream of their program, but most listeners don't hear it until weeks later on NPR. Podcasted versions of the programs split the difference, usually coming out a few days after the live program, but well before the traditional broadcast.
source:Wikepedia
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