Need help finding demo songs

The replies about Qobuz playlists are spot on. Reddit is also a good option

https://www.reddit.com/r/audiophilemusic/s/tnbO9zYlRs

https://www.reddit.com/r/musicsuggestions/s/oKZ4unbExh

Janis Ian - Breaking Silence

on the 1993 Breaking Silence Album

A quick Google will take you to a number of lists. Some of the big Audiophile websites and YouTubers have listed their recommendations and some added playlists to streaming services. 
 

I’d start with those and look to curate your own. As and when you hear a song/track that you think sounds great and demonstrates a certain attribute of your system, add it in. You are always better off with songs you are familiar with as that will help you measure new components. But don’t pick only songs that “sound amazing” as they might sound great on any gear. By this I mean there are songs that really push systems, speakers in particular. Try to look for those to add into the mix. 
 

perhaps share your playlist once you have one. Enjoy the hunt. 

My test tracks on Qobuz

I skip through this list, depending what I'm focusing on:

Suzanne Vega:  Suzanne Vega Tom's Diner

Diana Krall:  The Girl In The Other Room

Eva Cassidy: What A Wonderful World edit

Crosby, Stills & Nash:  Might as Well Have a Good Time

Norah Jones:  Don't Know Why

The Beatles:  Blackbird

Alison Krauss & Union Station:  Down to the River to Pray

Geoff Castellucci:  Sixteen Tons

Jeff Buckley:  Hallelujah

Simon & Garfunkel:  The Sound of Silence

Crosby, Stills & Nash:  Helplessly Hoping

The Beach Boys:  Summer's Gone edit

Eric Clapton:  Tears in Heaven

Paul Simon:  Diamonds on the Soles of Her Shoes

Steely Dan:  Do It Again

Santana:  She's Not There (Live from Moonflower)

Bob Marley & The Wailers:  Turn Your Lights Down Low

Michael Jackson:  Billie Jean

Jimi Hendrix: Little Wing

Led Zeppelin:  Stairway to Heaven

Guns N’ Roses: 7 November Rain

The Doors:  Riders on the Storm

Leonard Cohen:  You Want It Darker

Fleetwood Mac:  The Chain

DubXanne:  Roxanne

Steely Dan:  Hey Nineteen

Guns N’ Roses:  Sweet Child o' Mine

Led Zeppelin:  When the Levee Breaks

Pink Floyd:  Time

The Who:  Baba O'Riley

Dire Straits:  Private Investigations

Pink Floyd:  Us and Them

Pink Floyd:  Shine On You Crazy Diamond

The Dave Brubeck Quartet:  Take Five

Miles Davis:  So What

Royal Philharmonic Orchestra :  Danse macabre, op. 4