Similarly a lot of not as popular old music has never been remastered properly for new formats and this is one of the reasons collectors of old vinyl are often

Similarly a lot of not as popular old music has never been remastered properly for new formats and this is one of the reasons collectors of old vinyl are often on to something. A lot of it was created from vinyl masters and sounds sub-optimal in digital form. Interesting fact regarding Zep ][, thanks!