9/23, 1535, 87.7fm. Rap music heard on this channel in the higher elevations of northern Montgomery County. A more detailed search based on the "Streetz 87-7 102-1" ID heard on September 13 reveals that this is most likely WMTO-LD Norfolk VA, a low power TV station, which was recently granted a special temporary authority to operate an "ancillary or supplementary service within the Station's assigned digital channel frequencies". WMTO-LD is licensed for 3 KW on TV channel 6. The application also says that they're running the ATSC 3.0 standard for their television service. The STA expires in January 2022. (Links to the FCC applications and data via rabbitears.info.)
LPTV Engineering STA Application for WMTO-LD