I am looking for a simple MIDI sequencer, something that looks like "Band in a Box" (a product that I had a long time ago). Preferably a free one. The idea is that I can select a rhythm pattern (say, rock, pop, jazz, or variations of them) and then I can enter chords by typing their name (say, "C" or "Dm" or "CM7" and so on). After that I can play the composition. Actually, I need this for my guitar practice. I have melodies in my head that I need to practice. Or I have some ideas (melodies) that I want to try and make modifications of them. To do so I need a rhythm that I can play over and over again. After that, I also need a program that can convert (render) the MIDI sequences to MP3. Any suggestions?