Most lineups that promise to reflect the rich, diverse musical ecosystem of a given region actually don’t, but the Downtown Berkeley MusicFest warrants the claim. Unraveling at Berkeley various venues from Thursday to Sunday, the event’s seventh iteration features a host of genres, skewed somewhat toward traditional music, but with a few notable exceptions. In conjunction with the Berkeley Arts Festival, local, world-class pianist Sarah Cahill will perform works by the contemporary Japanese composer Mamoru Fujieda, whose principal interest is deducing and notating the musical expressions of plant life. Other offerings include a performance by the Indian sitarist Arjun Verma, a tribute to bluegrass originator Bill Monroe, a collaborative performance of Beck’s Song Reader, which he “released” only as sheet music, and Ren the Vinyl Archaeologist, a storied DJ and local chronicler of hip-hop culture. It could use some punk — but we’ll take it.