The instruments and amplifiers the venue or promoter provides for the band, as opposed to gear the band travels with. Standard backline at a venue might include a drum kit, bass amp, guitar amps, and a keyboard rig. Riders specify exact brands and models when possible ('DW Performance Series drum kit, 22" kick, 14" snare; Ampeg SVT-810 bass cab'). Backline-provided is huge for support acts and fly dates where bringing gear isn't practical. Some venues partner with backline rental companies to keep gear current.