Legendary Spinal Tap bassist Derek Smalls cranks it to 11 on TIJ with some serious truth-telling to set the record straight about the hatchet job documentary, “This Is Spinal Tap.” He’s got scientific proof to refute the alleged stage screw-ups and tin foil zucchini mishap. He’s also talking Live Earth, Glastonbury, his preferred bathtub fitness routine, and his Lukewarm Water nickname. Plus, Derek’s got stories about recording his debut solo album, “Smalls Change,” and the many incredible guest musicians who helped him out with the concept record including Foo Fighter Taylor Hawkins, Steve Vai, Joe Satriani, Donald Fagen, and Dweezil Zappa.