This program churns out catchy riffs. I don't know if I'm seeing all the program's buttons in Vivaldi, but I was able to quickly make a tune with this program.
["l2o3>dc<ba4g4","l4o5r8.d8ag<b4.b8>agg8.","l2o3g+g+g+2.g+4","l4o5r16d+16r16g+d+<g+4.r8g+8>d+d+d+8.",1,0,true]
["l2o3ra1a","l8o4r16g>d<g>e<a>e<a>e<aaaaaaaa16","l8o4r4a1","l8o4r16a>e<a>e<a>e<a>e<a>d<a>d<a>d<a>d16",0,1,true]
["l8o4d2d4d2defedc","l16o5r<ar>drd8<gr>d8dr<ar4gr>>dr<brb8br>dr<<g","l2o3g+g+g+2.g+4","l4o5r16d+16r16g+d+<g+4.r8g+8>d+d+d+8.",2,0,true]
["l8o3rfe>f<g2gd>g<f2","l8o4r16fbeggggggag>c<f>c<f>c16","l8o4r4a1","l8o4r16a>e<a>e<a>e<a>e<a>d<a>d<a>d<a>d16",1,1,true]