Autoscore can help overcome that deficiency, without expensive lessons or hours and hours of study and training. My attempts to stump the program were eventually successful, though I have to admit that if you find yourself singing or playing as badly as I had to, maybe you should get into something like flower arranging instead of music. For the most part, Autoscore was able to process just about anything I threw at it. Autoscore's interface is straightforward, and getting the results you want from the program is fairly effortless. You can set Autoscore to quantize not only your rhythm, but also to match your pitch to the nearest chromatic tone, or to stay within the confines of a particular major or minor scale.
System requirement are reasonable.
If your computer was made in the last three or four years, chances are it can run Autoscore. Installation of the software is quick and easy, at least on a Macintosh. Still, the PlainTalk microphone that came with my Mac functioned as expected, so no real problem there. If you're not exactly a musician, Autoscore can help you take those compositions out of the shower and onto a MIDI editing environment, in the most direct route possible.