One of the most auspicious arbiters of rock here in Austin is undoubtedly A. Sinclair. Since 2014’s Pretty Girls, Aaron Sinclair’s consistently curated an intricate indie rock sound bolstered by cavalier-but-calculated vocals and gorgeous guitar work, a legacy that’s continued with this year’s Sunshine Ghost LP. This two-time Studio 1A veteran joins a roster of fellow Mr. Pink Records artists this Sunday at Hole in the Wall for the release of A. Sinclair’s latest single, “Secrets”. Over a mere three minutes, “Secrets” escalates from a stripped-down pairing of dry vocals and acoustic guitar into an enormous, reverb-drenched indie rock masterpiece that’ll have you sharing it with your own network of music nerds in no time.