Mirren Boy said:
Again Linn explain everything on their own music store regarding all formats and always have done.
http://www.linnrecords.com/linn-formats.aspx
This statement is disengenuous in itself. The top selling online music stores (of which Linn is not one) sell or stream mp3 at or above 256Kbps, with 256 being the minimum. Certainly 128kbps can no longer be regarded as the norm.
It is the premise that 24 bit is inherently the best playback format that is wrong, when it can be demonstrated that CD resolution offers every bit of the audible quality and dynamic range of 24 bit. Lossy formats also have the ability to accurately portray this quality, but obviously there will be a threshold for audible artifacts at some point (not obvious dynamic compression or volume levels though).
Also people seem to be confusing mastering with remastering. An original 24 bit master will be mixed down for CD, this CD will exhibit every bit of the quality of the original master and subsequent compression to lossless and lossy will also retain the same quality as in the original master, right down the the level of compression artifacts that I mentioned before. Now, if the original master is remastered, the original sound has been changed (not neccessarily for the better as various releases show) and it becomes a different master. It could be argued that a 320kbps mp3 of the original, for example, is actually of better quality than the new master.