Just got started on Qobuz. Can anyone recommend an album or song?

Whatever the limitations may be in my other source components -- Sota Sapphire/ Hana ML/Moon Phono Stage; and a Sony XA5400 CD/SACD player --  Qobuz (via a Cambridge CXN) often delivers the best fidelity I get from my system. Idagio (which doesn't offer hi-res, just CD quality) can deliver lovely sound, as well.

Curt Elling.  Practical Arrangement

Thanks all for the recommendations.

Give Nasty by Vincent Ingala a listen. 

Lento by Youn Sun Nah

In fact, pretty much anything on the ACT label as their recordings are generally extremely well engineered.