The older 1989/1990 version does not have music, but there are a few sound effects on the pc speaker that work fine for me in DOSBox 0.74 with default settings. There is an option in the game settings to toggle sound, so ensure you have it enabled: press F1 until you get to the options menu and then press F2 to toggle sound. Also bear in mind that the sound effects are rather sparse in the game, but to check if they are working you can move to a town and click on the attack button instead of clicking "OK" to enter the town.
The 1994 enhanced remake has FM music and SB sound effects which seem to work without difficulty in DOSBox 0.74.