Compared to what? Maynardville?
"If you want to see a traditionally conservative, "sleeper tech city" look no further than Greenville, SC. Greenville has recently (in the last 7 years) entered a rapid development phase with numerous tech startups, co-work facilities, etc"
Nashville has checked all of those boxes.
Did I mentioned we have an incredibly active developer community here? Its not all big healthcare companies running Java & .Net, for instance, there is Emma (http://myemma.com/), Stratasan (http://www.stratasan.com/), The Skillery (http://www.theskillery.com/), Wannadao (https://www.wannadolocal.com/), inquicker (https://inquicker.com/), Moontoast (http://www.moontoast.com/), etc
We have events like coderfaire, hacknashville, hack-a-day, nashville code brigade, nashville user group leadership (group), etc
We also have very active user groups for functional programming, dynamic languages, ruby, php, python, javascript, flash, etc
We have tons of co-working locations, not going to name them all.
Not to mention that a ton of large SV types have remote workers here (I'm looking at you Github, SurveyMonkey, etc).
We have an incubator (http://jumpstartfoundry.com/).
What makes a city a "sleeper tech giant"?