Electronic music is both entrancing, and very difficult to make. While the purists who believe that classical music is the only “real” music (they do exist, and they’re quite serious), music like electronica has its own method to madness, and technical skill. If you’ve ever taken interest in this kind of music, and wanted to dabble in it, then playing with an analog synth might be fun.
The Analog Synthesizer SX-150 Mark II has a four octave range, and will let you show the world what you can do. It has vibrato, tremolo, and “wah” as well as 10 different parameters you can play with. If it suits your fancy, this can play nicely with other instruments as well, so you can combine the old and the new. There’s a line in and out at a 3.5mm jack size if you want to broaden your horizons a little, and this will cost around $100. This is a bit on the trinket side compared to what’s out there, but will still be useful if used to its fullest.