Arvo Pärt, the septuagenarian Estonian composer, ranks among the most important living composers of what for lack of a better term is still called “classical music.” His often ethereal, soaringly beautiful compositions are modern without jarring the listener as some avant-garde works do; they’ve caught on so thoroughly with listeners outside the usual classical circles that one critic was prompted to comment (comparing his success to that of Philip Glass), “Lately I’ve noticed that artificial Glass has increasingly been supplanted by pseudo-Pärt on TV and film soundtracks.” A new package from the giant record label Naxos, The Silence of Being, collects five discs of the composer’s work for the bargain price of $39.99. (A sixth, bonus disc gathers material by such other maverick composers as John Cage and George Crumb; that disc also appears in a new Naxos box devoted to Glass symphonies and concerti.) The set presents an array of Pärt’s music, containing some that is very famous — like “Fratres” and “Tabula Rasa” from 1977, the period during which he developed a signature compositional technique he dubbed “tintinnabulation” — along with more obscure pieces. It offers everything from string quartets to full orchestral works and unaccompanied choirs. The recordings are excellent, and while the CDs’ packaging doesn’t match the evocative design of some Pärt releases from the ECM label, the low price surely makes the tradeoff worthwhile.