▁stead ily ▁gained ▁further ▁complexity , ▁taking ▁on ▁a ▁more ▁varied ▁array ▁of ▁musical ▁styles ▁and ▁incorpor ating ▁more ▁and ▁more ▁difficult ▁techniques , ▁as ▁ev iden ced ▁by ▁his ▁two - hand - in dep end ence ▁on ▁Spirit ▁Tra il ▁" K ing ▁of ▁the ▁Hill ". ▁During ▁this ▁same ▁span ▁of ▁solo ▁album ▁years , ▁Horn s by ▁made ▁several ▁mini - t ours ▁playing ▁solo ▁piano ▁gig s ▁for ▁the ▁first ▁time ▁in ▁his ▁career . ▁The ▁shows ▁allowed ▁Horn s by ▁limit less ▁possibilities ▁for ▁segu ing ▁songs ▁into ▁other ▁songs , ▁often ▁bl urr ing ▁lines ▁between ▁classical ▁compos itions , ▁jazz ▁standards , ▁traditional ▁bl u egr ass , ▁folk , ▁and ▁fiddle ▁t unes , ▁Gr ateful ▁Dead ▁songs , ▁as ▁well ▁as ▁re work ings ▁of ▁Horn s by ▁original s . ▁ ▁Horn s by ▁reflected ▁on ▁these ▁periods ▁of ▁int ensive ▁solo ▁performances , ▁stating ▁that ▁the ▁solo ▁t ours ▁helped ▁him ▁" re commit ▁[ him self ] ▁to ▁the ▁study ▁of ▁piano " ▁and ▁" take ▁[ his ] ▁playing ▁to ▁a ▁whole ▁new ▁level ", ▁expl or ations ▁and ▁impro vis ations ▁that ▁would ▁not ▁be ▁possible ▁in ▁a ▁band ▁setting . ▁He ▁finally ▁released ▁his ▁first ▁entirely ▁live ▁solo ▁album , ▁simply ▁titled ▁Solo ▁Con cert s , ▁in ▁August ▁ 2 0 1 4 . ▁ ▁His ▁ 2 1 st ▁album , ▁Ab solute ▁Zero , ▁will ▁be ▁released ▁in ▁April ▁ 2 0 1 9