Many traders would, unrequested, fill unused space on the C-60 and C-90 tapes of demos they compiled for fellow traders with local bands in which they were members, or acolytes of. This led to a musical cross-pollination between geographically diverse and disparate areas such as Scandinavia, USA and the UK and their own bands/scenes.
Traders would often record demos for other traders, filling unused space on tapes with music made by local bands they were involved with. This led to a cross-pollination of musical styles between different regions like Scandinavia, the USA, and the UK, as well as their respective scenes.