If I remember right, Clark was planning to take Lois to a concert on one of their first dates but they couldn't go.
Also, I'd think that Lois and Clark might like something a little less formal, but more intimate like an evening of dinner and music at an upscale jazz club, or some such thing. Music always makes a nice backdrop for an evening where a couple can just be comfortable together. The option for companionable silence is there, as is low-toned more intimate converstations.
Besides, good music always puts people in good moods.
Tank (who is a bit biased, but there are few better forms of entertainment than music)
