I'm so used to seeing images of Joplin's vocal personality that I had to google about her guitar side..
She did indeed play the guitar.

And wait, this must be from a rare live recording session in which she is actually doing the strumming on the guitar. How fucccing cool!
RIP JANICE JOPLIN. AMEN

Someone needs to make a real good movie about Joplin's life, like they did recently about Elvis Presley.