The River Song manifests as a polished river stone, flat and oval, with natural striations that form what looks like sheet music at certain angles. Embedded in its surface are tiny fragments of blue sea glass, catching light like scattered water droplets. The cord is woven from reed fibers, naturally dyed with alder bark to a soft brown. Most distinctive: faint harmonic vibrations can be felt when the stone is held close to one's ear, as if the river itself is humming a melody only the worthy can hear.

The River Song grants its holder the ability to 'read the current' - they gain intuitive insight into how the McCormick course will play based on weather conditions, recent rainfall, and the seasonal state of the water. This strategic awareness extends to understanding how competitive momentum flows through the league, allowing holders to position themselves in the upstream position before the current shifts.