Most artists / composers has made music that I can get tired of, so I prefer to mention albums, musical works or compositions that I never get tired of listening to.

Above all is "Dark side of the moon" (Pink Floyd).
Also:

Boston (Boston)
Gaucho (Steely Dan)
Rumours (Fleetwood Mac)
Équinoxe (Jean-Michel Jarre)
"Around the world in a day" and "Sign o' the times" (Prince)
Symphony no. 9 (Gustav Mahler)
Scary Monsters (David Bowie)
Club Classics (vol. 1) Soul II Soul
Unfinished Sympathy (Massive Attack)
...and many, many others when I think about it... especially works from Bach, Chopin, Beethoven, Debussy and many of the Russian composers.

Will