I am amazed at the quality of some mp3 radio stations and the content is a key issue in station choice.
Broadcast quality depends upon their source equipment and their broadcast equipment not the format. Most of the stations are mp3/128 but excellent quality. Three extra flac stations.
I have the following classical playlist:-
Venice Classic Radio Auditorium (VCR1) (Italy)
URL http://116.202.241.212:8010/stream
Venice Classic Radio Live (VCR2) (Italy) (aac)
URL http://116.202.241.212:8020/stream
The Classical Station (WCPE) (North Carolina, USA)
URL http://audio-mp3.ibiblio.org:8000/wcpe.mp3
WRTI 90.1 Classical (Philadelphia, USA)
URL https://playerservices.streamtheworld.com/api/livestream-redirect/WRTI_CLASSICAL.mp3
Minnesota Public Radio Classical (USA)
URL http://cms.stream.publicradio.org/cms.mp3
WCRB Classical (Boston, USA)
URL https://streams.audio.wgbh.org:8204/classical-hi
WKSU Classical 89.7 (Ohio, USA)
URL http://66.225.205.8:8030
WETA 90.9FM Classical (Washington D.C., USA)
URL https://playerservices.streamtheworld.com/api/livestream-redirect/WETAFM.mp3
Radio Swiss Classic (SRG SSR) (Switzerland) (aac)
URL http://stream.srg-ssr.ch/m/rsc_de/aacp_96
SwissRadio Classical (Switzerland)
URL http://relay.publicdomainproject.org/classical.mp3
All Classical Portland (USA)
URL https://allclassical-ice.streamguys.com/ac96kmp3
Classic FM (UK)
URL http://media-sov.musicradio.com:80/ClassicFMMP3
AbacusFM Mozart (Vancouver, Canada)
URL http://185.80.221.113:8046/stream
Epic Piano Chopin non-stop (Germany)
URL https://stream.epic-piano.com/chopin
WQXR Classical (New York, USA)
URL http://stream.wqxr.org/wqxr
Organlive (USA)
URL http://play2.organlive.com:7000/320
Baroque (1.FM) (Switzerland)
URL https://strmreg.1.fm/baroque_mobile_mp3
Otto’s Classical Music (1.FM) (Switzerland)
URL https://strmreg.1.fm/classical_mobile_mp3
Otto’s Opera House Music (1.FM) (Switzerland)
URL http://185.33.21.112:80/opera_128
Ancient FM (Canada)
URL https://mediaserv73.live-streams.nl:18058/stream
Polskie Radio 2 (Warsaw, Poland)
URL http://stream3.polskieradio.pl:8902/
Hi On Line Radio Classical (Netherlands)
URL http://mediaserv30.live-streams.nl:8088/stream
Linn Classical (UK)
URL http://radio.linn.co.uk:8004/autodj
Naim Classical (UK) (flac)
URL http://mscp3.live-streams.nl:8250/class-flac.flac
Cesky Rozhlas D-dur (Prague, Czech Republic) (flac)
URL http://amp.cesnet.cz:8000/cro-d-dur.flac
Rondo classic Klasu Pro (Helsinki, Finland) (flac)
URL http://rondo.iradio.fi:8000/klasupro.flac
Rondo classic Klasu (Helsinki, Finland) (flac)
URL http://rondo.iradio.fi:8000/klasu.flac
Klara Continuo (Brussels, Belgium)
URL https://vrt.streamabc.net/vrt-klaracontinuo-mp3-128-6851541