Can’t vouch for their accuracy on classical music, but SoundHound[1] and Midomi[2] might be worth a try.

[1]: http://www.soundhound.com/soundhound

[2]: https://www.midomi.com/

Try asking Siri or Google Assistant “what song is this?”

I wouldn’t bet on Siri doing better. Apple bought Shazam in December 2017 (https://www.cnbc.com/2017/12/11/apple-confirms-shazam-deal-b...), completing the deal in 2018 (https://www.apple.com/newsroom/2018/09/apple-acquires-shazam...), so Siri likely uses Shazam under the hood.