Plaguescarred
Hero
The devs have ruled that the holy symnol can be used as foci while wielding a weapon and a shield. For all others, there is always the War Caster feat. 

During the play test, I had a big issue with the (ever-changing) way foci were being presented, because everyone could use them one-handed, except the bard. Well, the bard *could*, but it was silly (you didn't play your lute to get the benefit, you just held it out and shook it at the opponent).
When released, the game had made changes, both with what the focus did, and that it was essentially interchangeable with a material components pouch. Despite their training in musical instruments, I think that many bards will naturally take the pouch instead because conceptually it only requires one hand.
I've not seen enough bards in lay to have a clear sense of this. So, problem solved, I guess, but it still doesn't feel fully satisfactory.
I was going to post the very same thing! People get stuck in a rut thinking every bard has to use a lute. If you are looking for ideas for musical instruments for bards, consider checking out the http://mim.org/ for pictures. Many of them can be used hands free, one handed, etc.
Jon @DBassJon Sep 3
@JeremyECrawford can a Cleric or Paladin cast spells requiring somatic components when wielding weapon + shield emblazoned with holy symbol?
Jeremy Crawford ‏ @JeremyECrawford 15h
@DBassJon I'd say yes if the holy symbol is being used as the material component of the spell, so yes if "S, M," but no if only "S"
I personally don't like that ruling, but there you have it.
It's not the case that players are unimaginative. The PHB has specified ten options, all of which in practical terms require two hands to play.
In 3e we typically played by the rules: you needed a free hand to cast spells with somatic component, so you had to take into account every action for freeing your hand (such as dropping or stoving a weapon and then retrieving it, or changing hands, whatever the action economy dictated). That's because 3e was highly tactical, and this sort of things mattered. Noting shortcuts like mace-straps or whatever, the tactical choices were supposed to be part of the game, so you either accepted this tactical edge of 3e or completely removed the issue of somatic components (for everyone, not just the cleric) without a need for explanation.
In 5e I don't feel like I want to go back to that tactical detail, at least for a long time. So I am basically just considering somatic components irrelevant, except perhaps in corner cases when it might sound interesting to add some challenge (e.g. a character is completely immobilized, or is using both hands to holding something important, or to hold herself from falling).
Verbal components are actually the more interesting ones to decide about. If you enforce "full volume" required, you have spellcasters who can't cast spells while hiding, or who can't conceal their spellcasting while for example in a social environment. However this is not necessarily the right choice. It's just as valid to have a fantasy world where spells can be whispered, as a way to conceal them, or stay hidden while spellcasting; considering that you can always let the dice decide (i.e. request a Hide or similar check), I will probably allow this to happen. Completely removing verbal components on the other hand may have more significant consequences, for instance in the interaction with spells like Silence so I won't probably go that far.
You just proved my point. Players who say "but there's only 10 intstruments in the PHB" are unimaginative. There are not ten options in the PHB, there are ten examples. Options are essentially infinite and only depend on the player and DM to agree to something they find reasonable.
Jon @DBassJon Sep 3
@JeremyECrawford can a Cleric or Paladin cast spells requiring somatic components when wielding weapon + shield emblazoned with holy symbol?
Jeremy Crawford ‏ @JeremyECrawford 15h
@DBassJon I'd say yes if the holy symbol is being used as the material component of the spell, so yes if "S, M," but no if only "S"
I personally don't like that ruling, but there you have it.
For all others, there is always the War Caster feat.![]()