The MMPI is not 'for' the police force. It's a widely accepted personality assessment (the acronym stands for Minnesota Multiphasic Personality Inventory). I'm as paranoid as the next guy (the next guy being Alex Jones) but come on.
Do ya see where I'm going here?
See where I'm going with this yet?
If you're forced to hold it that close to your mouth to be picked up you're either not singing or a total idiot.
To your specific point though, they probably should simply not do thoes songs live. They should be upfront about it with the audience too. Whats wrong with saying "you know what that particular work is a studio pice; I thought was fun and my audience would appreciate its not something I can do live; without kit.?
Or, ya know, not be a pussy and come up with a different way to perform it so they can play it live. There's no law that says you have to play your songs the same way every time.
Say "twenty-three-skiddoo" to logout.