4 Strings are 2 musicians - Carlo Resoort and Jan de Vos. They have known each other since 1986. In 1990 they became interested in dance music and from that moment on, they started producing their own music.
All their spare time was spent in the studio. Throughout the next couple of years not only did their skills expand but also the amount of equipment in their studio. With the new tools and experience that they had, they could finally discover in which direction they wanted to go with their musical careers: Carlo decided to stay in the studio while Jan found his passion in mixing and started his DJ-ing career.
In 2004, there were some rumors of singer Vanessa van Hemert leaving the group, due to some new 4 Strings songs that were released that did not feature van Hemert. On the official 4 Strings website, Resoort debunked the rumors. Although in 2005, van Hemert did leave the group. While Jan De Vos isn't actually a part of 4 Strings, he took up the name DJ 4 Strings and does all live performances in place of the actual group.