Classics you can't have too many recordings of

Mozart, Mahler, Strauss, Wagner (can you tell I am a horn player?), Bartok, Stravinsky, Gesualdo, Bruckner, Bach, Beethoven, to name 10 off the top of my head, though not necessarily in the above order.

Fugazi 13

Brahms: Symphonies 3 and 4, Double Concerto, Piano Concerto #1 and virtually all his mid to late chamber music, especially the Clarinet Quintet

Dvorak: Symphony #8, Cello Concerto and mid to late chamber music

Sibelius: Symphonies 4 and 5 and Violin Concerto

Vaughan Williams: Symphonies 3 and 5

Mahler: Symphonies 4 and 6

Bruckner: Symphony #5

Tchaikovsky: Symphony #6

Rachmaninoff: Symphony #2

Bartok: Concerto for Orchestra

Beethoven: Triple Concerto

Berlioz Symphonie Fantastique

Sibelius: violin concerto and symphonies 4, 5 & 6

Bach Art of the Fugue

Rachmaninoff, Rhapsody on a theme by Paginini
Chopin, Andante Spianato, etudes, nocturnes and waltzes
Haydn piano trios
Mozart piano concertos
Bach Partitas
Dvorak quintets
Gershwin Rhapsody in Blue
all based on having at least 3 or 4 or more of the above in my collection

Beethoven's piano sonatas. Beethoven's quartets. Beethoven's Symphonies. Did I mention I like Beethoven? Then there is Bach. The Matthew and John passions. The cello sonatas. The Sonatas and Partitas for violin.

Shostkovich's 24 Preludes and Fugues

Monk's Blues (well, I think it's a classic)

Any and all and In no particular order of the following fab three;
Puccini, Rossini and Verdi,

Count me in for "Pictures at an Exhibition"

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Bach's cello suites
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Dvorak's 9th, Tchaikovsky's violin concerto, Rachmaninoff's vocalise, 2nd + 3rd piano concertos, Dvorak's violin concerto, Brahms' 3rd + 4th symphonies, Beethoven's 5th, Prokofiev's violin concertos, and several of Mozart's symphonies. But there are just so many more.

Michael

Bach's Mass in B Minor and Brandenberg concertos; Beethoven's Eroica, Fifth, and Ninth symphonies, and piano concertos; Gershwin's America in Paris and Rhapsody in Blue, Mahler's Das Lied Van Der Erde; to name a few.