P4260008P4260010 The sound system for the entertainment provided at yesterday's Solar Sunday event at Hey Cupcakes on Burnet Rd was powered by the mobile solar system you see in the picture above provided by Sustainable Waves  (www.sustainablewaves.com). The company specializes in providing solar powered stages, sound systems, and lighting for entertainment events. Other companies at the event included, Pure Light (www.thinkpurelight.com), a local LED light bulb distributor, and Green City Solar (www.greencityaustin.com), a solar energy company.