Here's a quick modal jazz improvisation in 7/8 time signature that I recorded with my Ipad in my last cegep session. What can be tricky about modality (modal system) is that the tonality (unlike the tonal system) moves a lot through the harmony, so it really feels like the key of the song is constantly changing and at first it can be very confusing to choose which notes to play on which chord.
Hope you'll like it!
Laurent