Mother Earth has a new ally on viedeo with this concert-cum-music-videotape from the "Slugs." Like their natural counterparts, the band is surrounded by redwoods on stage. By the tape's end, they become trees as they exhort their young audience to sing and dance to "I'm a Tree." Other songs extol marshlands as ducks go "Butts Up" to eat, tidepools in the colorful on-location "Tidepool Boogie," and the food chain in "Dirt Made My Lunch."