4501
One day while Joan was playing piano in lodgings they were sharing while on tour , Pam showed her some of her poems and Joan set them to music , and so their writing partnership was born .
 Pam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pam