When playing a lot in MR and especially making the same route again and again, and in night - i feel some in game radio or some cassette/CD player will be highly appreciated. I play in head monitors, so external music is impossible. And anyway in game music will be much more immersive.
What kind of music? Hard to tell...not too loud, not an ambient, i dont know.
Actually being a hater of Shanson - its russian special "ex-prisoners" themed songs - i know that most russian drivers listen only Shanson, and in this particular game and place - i would vote for Shanson!!!)) It would be very authentic and fun.
But i dont know foreigners reaction...
But second radio needed for usa trucks...some country music maybe?
You always can turn it off, or make the sound less - but sometimes it will help you not to be bored to death with MR, (&play it&play it& and buy it and its dlc)))
So two radio stations, or "mp3 mixes" - I VOTE for it to be added in MR2!
(I remember shock and deeep immersion in Gta vice c. hearing billie jean for the first time)