Given the following passage  "A reconciliation of these views is suggested by William Atwood: "Undoubtedly [Chopin's] use of traditional musical forms like the polonaise and mazurka roused nationalistic sentiments and a sense of cohesiveness amongst those Poles scattered across Europe and the New World ... While some sought solace in [them], others found them a source of strength in their continuing struggle for freedom. Although Chopin's music undoubtedly came to him intuitively rather than through any conscious patriotic design, it served all the same to symbolize the will of the Polish people ..."",  answer the following question. Note that the answer is present within the text.  Question: According to Atwood, the Polish people found a source of strength in what?
A:
Chopin's] use of traditional musical forms like the polonaise and mazurka