Tidal takes a feed from the music companies. This feed will contain the entire live (ie not deleted) digital catalogue. When a remastered album is released the record label generally deletes the pre-existing version of the album. So at the point at which a streaming service sets up and takes its initial feed from the music companies they will be supplied the latest master. If a streaming service had already been delivered the older master they will continue to have it on their service if a new remaster is delivered. It is then up to the streaming service whether they continue to hold this on their service.
It is generally not possible for a streaming service to access a digital master that existed before they existed but was superseded prior to the streaming service being created. That is because, as I said at the top, a record label will not deliver deleted products as they are not part of the live catalogue.
With regard to @mahler123's point re classical. Remastered classical music sounds better as the music that is remastered in the classical domain is generally older pre 1970s repertoire which can be cleaned up and improved whilst not changing the compression or dynamic range. @mahler123 also enquirer why it could be a bad thing to be remastered: unlike classical, pop/rock music is remastered with more 'loudness', more compression and a reduced dynamic range. This is to help the music sound comparable with modern production techniques and to sound better in the noisy environment of earbuds and car stereos. Many audiophiles consider this a backward step in sound quality, hence they seek out earlier editions of the master recording. For CDs this is often the original master tape transfer from the 1980s.
It is generally not possible for a streaming service to access a digital master that existed before they existed but was superseded prior to the streaming service being created. That is because, as I said at the top, a record label will not deliver deleted products as they are not part of the live catalogue.
With regard to @mahler123's point re classical. Remastered classical music sounds better as the music that is remastered in the classical domain is generally older pre 1970s repertoire which can be cleaned up and improved whilst not changing the compression or dynamic range. @mahler123 also enquirer why it could be a bad thing to be remastered: unlike classical, pop/rock music is remastered with more 'loudness', more compression and a reduced dynamic range. This is to help the music sound comparable with modern production techniques and to sound better in the noisy environment of earbuds and car stereos. Many audiophiles consider this a backward step in sound quality, hence they seek out earlier editions of the master recording. For CDs this is often the original master tape transfer from the 1980s.