Home Jambase Full Show Audio: Greensky Bluegrass Covers Tom Petty & Welcomes Silas Herman...National Music NewsJambaseMusicFull Show Audio: Greensky Bluegrass Covers Tom Petty & Welcomes Silas Herman In DenverDecember 2, 2016612FacebookTwitterPinterestWhatsApp Listen to last night’s GSBG show featuring a special guest and cover debut.