A group of music enthusiasts has launched a non-profit to unite and grow Cleveland’s music scene. For this week’s Shuffle, we hear about Sixth City Sounds , which launched this summer by bringing local music to the public -- whether in a coffee shop or at a bus stop. On a bright, hot afternoon earlier this month, Cleveland singer-songwriter Rachel Shortt set up a microphone and amp and performed some songs with her acoustic guitar while commuters mulled around University Circle’s Little Italy