The production of collinear muon pairs has been studied using the JADE detector at thee + e − storage ring at PETRA. Results for the total cross section and the angular distribution were obtained at centre of mass (cm) energies ranging from 12 to 46 GeV. The data correspond to an integrated luminosity offLdt>90 pb−1, of which 71.2 pb−1 were taken at ⟨s√⟩ =34.4 GeV and 17 pb−1 at ⟨s√⟩ =42.4 GeV. The results are compared to electroweak theories, in particular the “Standard Model”.