For what it's worth
Stereolab: up to around five... it's really just the 'avoid obsession' rule here.
Burt Bacharach: a maximum of two.
Henry Mancini: one is allowable if there is no Bacharach.
Tribute albums to the previous two artists: one, if the participating artists are valid.
Red Hot + (whatever) compilations: two.
Rebirth of Cool: three.
Cafe del Mar: two, as part of the 'coffee coaster rule' which dictates a maximum of five ambient chillout releases, and only if they are from different labels and don't contain repeats... oh Ibiza chillout; it was ubiquitious but did you ever really notice?
Burt Bacharach: a maximum of two.
Henry Mancini: one is allowable if there is no Bacharach.
Tribute albums to the previous two artists: one, if the participating artists are valid.
Red Hot + (whatever) compilations: two.
Rebirth of Cool: three.
Cafe del Mar: two, as part of the 'coffee coaster rule' which dictates a maximum of five ambient chillout releases, and only if they are from different labels and don't contain repeats... oh Ibiza chillout; it was ubiquitious but did you ever really notice?