If you're interested in ------, listen to this one.

[Rosalba]

Post a 'must-listen' for a beginner in a particular classical era or genre (or for a particular musical instrument.)

Even better if you are a beginner - post what has really grabbed you in a particular classical era or genre (or for a particular musical instrument, or a particular performer.)

Thank you.

[Rosalba]

If you're interested in baroque violin, listen to Biber's Mystery Sonatas also called Rosary Sonatas, starting with this one.

Mystery Sonatas:The Assumption of Mary (Elizabeth Wallfisch)
https://www.youtube.com/watch?v=h5fbrDuihjQ

[Jo498]

In the 1990s the BBC music magazine had for a while a German version, I believe (or in any case I had a few issues that must have been a good deal, not some expensive import because I usually didn't buy magazines, even with included CDs). And I think they had a section or series "What to listen to after/if you like X?" with X being a famous/well known piece and the suggestions often considerably lesser known pieces. (Unfortunately, I don't remember any details and didn't keep the magazines)
In a time before or with only rudimentary internet this often had great suggestions, not only for beginners. (In fact for beginners there is usually so much to explore one hardly needs specific recommendations.)
Nowadays and in such a forum it is almost impossible to recommend/suggest something not already well known or suggested many times.

If you like Mahler's "Das Lied von der Erde", listen to Zemlinsky: "Lyrische Symphonie"

[Rosalba]

If you're interested in the sound of classical guitar, you may like La Alborada by Francisco Tárrega - it's a gem.

https://www.youtube.com/watch?v=d6iZB1P9aHY

[Betthoi]

If you're interested in the sound of classical guitar, you may like La Alborada by Francisco Tárrega - it's a gem.

https://www.youtube.com/watch?v=d6iZB1P9aHY

Amazing! He is so gentle but confident with the guitar, just great to listen and watch!

[Wanderer]

If you like Ravel's Piano Concerto pour la main gauche, listen to Korngold's Piano Concerto.
If you like Ravel's Piano Concerto, listen to Fould's Dynamic Triptych.
If you like Schönberg's Violin/Piano Concerti, listen to Skalkottas' Violin/Piano Concerti.

[Wanderer]

If you're interested in baroque violin, listen to Biber's Mystery Sonatas...

Also, Leclair's Violin Sonatas and Concertos and Locatelli's L'Arte del Violino.

[Pohjolas Daughter]

If you're interested in baroque violin, listen to Biber's Mystery Sonatas also called Rosary Sonatas, starting with this one.

Mystery Sonatas:The Assumption of Mary (Elizabeth Wallfisch)
https://www.youtube.com/watch?v=h5fbrDuihjQ

Don't often listen to much baroque music, but enjoyed this one.

If you're interested in cello music particularly 20th century, do check out Kodaly's sonata for solo cello.

https://www.youtube.com/watch?v=qpCXNI9k9PQ

PD