22 Seismic Sound Drumline | BDX 2018 Seismic Sound Drumline performing at the 2018 BDX Drumline showcase. This was the 10th annual BDX at Garfield HS in Seattle WA. The BDX will be moving locations and re branded for the 11th annual this coming May. SodanoMusicOctober 29, 2018654 0