In　this　paper,　the　nonlinear　dynamic　behavior　of　a　string-beam　coupled　system　subjected　to　external,　parametric　and　tuned　excitations　is　presented.　The　governing　equations　of　motion　are　obtained　for　the　nonlinear　transverse　vibrations　of　the　string-beam　coupled　system　which　are　described　by　a　set　of　ordinary　differential　equations　with　two　degrees　of　freedom.　The　case　of　1:1　internal　resonance　between　the　modes　of　the　beam　and　string,　and　the　primary　and　combined　resonance　for　the　beam　is　considered.　The　method　of　multiple　scales　is　utilized　to　analyze　the　nonlinear　responses　of　the　string-beam　coupled　system　and　obtain　approximate　solutions　up　to　and　including　the　second-order　approximations.　All　resonance　cases　are　extracted　and　investigated.　Stability　of　the　system　is　studied　using　frequency　response　equations　and　the　phase-plane　method.　Numerical　solutions　are　carried　out　and　the　results　are　presented　graphically　and　discussed.　The　effects　of　the　different　parameters　on　both　response　and　stability　of　the　system　are　investigated.　The　reported　results　are　compared　to　the　available　published　work.