I'm going to be running my first dungeon world game soon and I'm wondering, is there a recommended party composition?

I'm curious because one of my players said wanted to be a bard, but thinks he might be fighter instead because the rest of the party (a druid, a thief, maybe a wizard) seems awfully scrawny and could use a good melee class.

Does the typical dungeon world party need a good heavy-hitting class, or do you think he would be fine playing as a bard?