Could be anything - as long as it's not the vapid pop called "R&B" (I like Rhythm and Blues), rap or similar paens to manufactured inability!
Most of my music comes from the radio and I listen selectively so it might be an opera, the said rhythm-&-blues, folk, Baroque, obscure avant-garde jazz-rock (though that's usually late-night, not early-evening), a Romantic concerto (Rachmaninov, say) or Modern symphony (Sibelius or Holst for example), jazz, contemporary (sometimes premiered) orchestral, some Musical standards, rock...
Oh, and I like to relax but I'm not normally a couch-potato.
I listen to EVERYTHING, seriously my mix goes from Lady Antebellum to Van Halen to Eric Church to Michael Jackson to Creed to Rascal Flats, to Jason Aldien to Five Finger Death Punch, to Fleetwood Mac...you get the point.
Only found out near the end of the programme this evening that one of my favourite composers, Sibelius, had been "Composer Of The Week" this week, and I don't know if I can use the BBC's on-line "Listen Again" service! The programme is a 5-day serial biography of the week's subject, illustrated with his or her music.
Must remember to buy the Radio Times regularly - it's the ONLY listings magazine I know of, to help you choose by telling you more than just titles and times of radio programmes.