Since you are interested in 40 Most Beautiful Arias, here is a list of other items that you may find interesting.
The Opera Album 2011 [2 CD set]
Bryn Terfel, Tatiana Troyanos, Magdalena Kozena, Renée Fleming, Cecilia Bartoli, Roberto Alagna, etc
[ Decca Music Group / 2 CD - released 9/Jun/2011 ]
With a carefully chosen selection of perennially popular arias, duets and choruses, this enchanting collection creates the perfect introduction to opera.
Luciano Pavarotti, Placido Domingo, Jose Carreras, Jonas Kaufmann, Juan Diego Florez, Joseph Calleja, etc
Ten Top Tenors (2CD)
[ Decca / 2 CD - released 13/Nov/2015 ]
This 2CD album brings together ten of the most famous tenors, performing nearly 50 of the greatest arias of all time. It also features a 16-page booklet with everything you need to know about each tenor - nationality, short biography, best recording,...