STANDBY (when shutting lid) V.S. DOING NOTHING

My question is a simple but a good one in my opinon, i was just wondering if i have my power settings on my laptop to do nothing wheni close my lid, well does that cause damage to my laptop? should i have the settings set to go into standby or have it do nothing. For example, i listen to music while doing something elce away from my laptop, and i shut the lid so dust or w/e doesnt get into or on my keys on my keyboard. i leave the computer running so that i can still listen to music, is that healthy for my laptop??
 
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