What you're looking for is gapless playback. JRiver does support gapless playback.
The settings in MC for gapless playback are in:
Tools >> Options... >> Audio >> Track Change
Change "Switch tracks" to gapless
Clear the checkbox for "Do not play silence (leading and trailing)"
Set the checkbox for "Use gapless for sequential album tracks"
The default setup for MC is to have gapless playback for sequential album tracks. If you were not getting gapless playback for your Pink Floyd then that indicates that MC may not be seeing your albums as complete albums.
MC has some rules for what it considers a complete album and for what it considers sequential tracks
The rules are explained in the following wiki articles:
http://wiki.jriver.com/index.php/Multiple_Artist_Albumshttps://wiki.jriver.com/index.php/Album_Artist_and_Album_Artist_(Auto)
The important rules being:
An album is considered complete if the following conditions are met:
all tracks are of [Media Type]=Audio
all tracks have exactly the same, non-empty [Album] value
all tracks are in the same folder - i.e. have the same value for the [Filename (path)] field
all tracks have sequential [Track #] values starting at 1
all tracks have the same, or sequentially increasing [Disc #] values (empty and 1 are considered the same)
Check to verify that your files are tagged and organized in a way that MC will see your albums as complete albums. Make sure all tracks for an album are in the same directory and have the same Album title and have the same Album Artist name.