Lens elements having a generally curved shape with a flat surface mounted adjacent an LED for improving the light transmission efficiency and the dispersal pattern of radiation emitted by the LED are disclosed. The Continuous Music Keyboard resembles a traditional keyboard in that it is approximately the same size and is played with ten fingers. The superior andor inferior sections can include a pair of lateral walls configured to engage a spinous process of a vertebra. When the source server determines that a matching listing exits on the provider server, the source server transmits to the provider server the enhanced listing with the identifier employed by the provider server as an indication to the provider server to update the listing on the provider server with the enhanced content. However, for those particularly loyal customers, additional moneys would be paid out from a loyalty reward pot.