Preferably Impulse Tracker as it seems to be the most feature-rich of all major ones. MIDI is too limited and lacks any good authoring tools and the MML is even worse.

class hrt var x= 75 var y= 48 var v= 4 var nombre= "corazon" var color= rgba (0,228,54) var cor = load_resource ("hrt.sprite") endclass grav=1 def update(delta) collision() '-- Drawing Commands -- rectfill 0,0,160,128, rgba (255,241,232) spr hrt.cor,hrt.x,hrt.y text hrt.x-23,hrt.y-8, hrt.nombre,hrt.color text 30,30, "love basic 8", rgba (255,0,77) '-- Adding Gravity-- 'hrt.y=hrt.y+grav ' -- x´s and y´s Coordinates -- text 8,7,hrt.x, rgba (0,0,0) text 8,17,hrt.y, ...

swordname$="sword" swordid$=1 swordmake$="1" make$=1 class sword var kills=0 var attack=0 var special=0 var name="sword" var id=1 endclass if make$=1 then swordname$ swordid$=swordmake$ if make$=1 then swordmake$=new sword swordmake$.id=swordid$ make$=0 def update(delta) if keyp asc("q") then print sword1.name enddef update_with(driver())...

I suspect this happens because the clipboard overflows something, as what I copied was pretty big. Maybe this is not a bug and strings are not supposed to be this long? Still it should not close unexpectedly :p This is what I copied: t92r2v15ggggg8.g+8.g8fb+ggggg8.g+8.g8f>ccccccd32d+16.l8d<a+4a+g+g4fcc+.c.c2&cr2l4ggggg8.g+8.g8fb+ggggl8.ga+g+8g4>d32d+16.d8dn58l32cc+l8&c+.c4<cgg+cl4gg+.g+.a+.g+cr8fr8eg.f.cg8g+8g8f.g+g.f.c<g+8g8g+8>c.g+g.f.cl8gg+gf2&f<a+.b+.a+>f2grl4crc+l21fr64fr64fr64fr64fr64fr64fr64fr64>e...

As basic as BASIC8 is, there should be a place for people to suggest features they'd like to see, without clogging up the latest update comments.