Why Lisa Kudrow was nervous singing ‘Smelly cat’ on ‘Friends: The Reunion’

#39;……I realised I had to learn #39;Smelly cat #39; again, and I tuned my guitar and then realised I don #39;t know the chords. But I googled it. All the chords were there for #39;Smelly cat #39;, #39; Lisa said.