No, not your security blanket (although it can get chilliy in Mom's basement). This is a music thread and I hope you'll /cough/ rush /cough/ to add your comments...
What do you think is the best cover version of a song you ever heard? Live or recorded, the best performance of a previously recorded song other than by the original artist-composer.
Being a fan of Louis Armstrong... I'm going to give the nod to The Ramones cover of "What A Wonderful World". Honorable mentions later in the thread.