I have a bunch of test tracks which I use with new equipment to push it to its limits and to spot audibile issues, some of them also to check speaker and listener positioning and bass balance.
This is what's currently in my test tracks folder:
Cassadó: Cello Suite - I. Preludio-Fantasia (Starker, Denon)
Prokofiev: Sinfonia Concertante In E Minor, Op125 - I. Andante (Chang, EMI)
Rachmaninoff: Symphonic Dances, Op45 - I. Non Allegro (Jansons, EMI)
Scriabin: 12 Études, Op8_12 - Étude In D-sharp Minor (Subdin, BIS)
Liszt: Eine Faust-Symphonie, S108 - III. Mephistopheles (Inbal, Denon)
Tchaikovsky: Symphony No.4 In F Minor, Op36 - III. Scherzo (Mravinsky, DG)
Beethoven: Symphony No.9 In D Minor, Op125 "Choral" - IVa. Presto (Giulini, DG)
Prokofiev: Alexander Nevsky Cantata, Op78 - IV. Arise, Ye Russian People (Mata, Dorian)
Scarlatti: Keyboard Sonata In B Minor, K27 (Ross, Erato)
Sarasate "Zigeunerweisen, Op20" (Mutter, DG)
"Con La Madre" (La Reverdie, Arcana)
Zéspedes: Guaracha - Convidando Está La Noche (The Harp Consort, Harmonia Mundi)
Sarah Vaughan "Great Day" – vocals, mood
Miles Davis "'Round About Midnight" – muted trumpet
Ron Carter "Saguaro" – piccolo double bass
Yussef Lateef "The Plum Blossom" – delicate flute
Paul Chambers "Yesterdays" – bowed double bass (great for testing speaker/room balance)
Benny Goodman "Moonglow" – swing
Bill Evans "The Peacocks" – piano
Anouar Brahem "The Astounding Eyes Of Rita" – el oud, tone, soundstage, relief
Dave Brubeck "Far More Drums" – rythm/ drive, drums, soundstage, relief
Dave Grusin "Shop 'Till You Bop" – rythm/ drive, drums, soundstage, relief
Nina Simone "Sinnerman" – complexity, vocals, tone, clarity
Alice Coltrane "Turiya & Ramakrishna" – complexity, tone, clarity, soundstage, relief
Leonard Cohen "Avalanche" – vocals, mood
Beirut "Elephant Gun" – complexity, tone, clarity, soundstage, relief
The Strokes "You Only Live Once" – rythm/ drive, tone
Yann Tiersen "Les Jours Tristes (Instrumental)" – rythm/ drive, tone, soundstage, reflief
Aimee Mann "Momentum"– rythm/ drive, tone, soundstage, reflief
Lou Reed "Dirty Boulevard" – rythm/ drive, tone, soundstage, reflief
Spain "God Is Love" – complexity, vocals, tone, clarity, soundstage, relief
Ben Harper "Jah Work" – acoustic guitar, vocals, tone, clarity, soundstage, relief
Cowboy Junkies "Rock & Bird" – vocals, tone, clarity, soundstage, relief
Tom Waits "Black Wings" – vocals, tone, clarity, mood
Pixies "Hey" – dynamic swings, soundstage, relief
Rolling Stones "Sympathy For The Devil" – caustic guitar solo
Ruben Gonzalez "Cumbanchero" – piano, double bass
Bert Jansch "Angie" – acoustic guitar
Andy Statman "Dveykus Nign" – clarinet, soundstage, relief
Ladysmith Black Mambazo "Nomathemba" – choir, clarity
Mercedes Sosa "La Maza" – vocals, percussion
Radio Tarifa "La Mosca" – rythm/ drive, soundstage, reflief
Ali Farka Touré "Ai Du" – rythm/ drive, soundstage, reflief
Warsaw Village Band "Do Ciebie Kasiuniu" – percussion overhang, clarity
Brigada Víctor Jara "Laço dos Ofícios" – percussion, bagpipes
A Cumpagnia "Tempi Di Sumenti" – choir, clarity, spatial cues
Ora Sitner "Beer Bassadé" – vocals, percussion
Andy Statman "Bedekens Nign" – soundstage, relief