newshour, mike cerre reporting in hanoi, vietnam. >> woodruff: finally tonight, many of you may know bob boilenhe host and creator of npr's "all songs considered," one of the most downloaded music podcasts. at the popular 9:30 club in washington, d.c. recently, jeffrey brown sat down with boilen, whose own band was the first to play that club 35 years ago. his new book "your song changed my life" recounts the history of modern music through voices boilen has encountered. >> brown: your book, "your song changed my life," right. that's true, i mean a lot of people would say that, but why? have you figured out what it is about music that has that impact? >> i think it's so visceral. there is a-- music is so different than everything else. it's not tangible, you don't see it, you-- it hits you on a level that is deeper than what we do and see in everyday life. i think it's pure emotion and tone, and a lyric, somebody saying a lyric that repeats over and over can be a call to action for somebody. i tell stories of people whose lives were changed by a song, and often in those formative years, what so