Yes, Buy a low cost midi keyboard and then build your loops within the DAW program.
You can download all kinds of midi synths, keyboards, and drums for the voicing and arrangements.
I'm not sure what kind of midi package Ableton live has. Some DAW programs are better than others
but most will allow you to build arrangements. Its not going to have pre made midi loops, but you can
download and import many of those, then cut paste and alter them as you want.
You can buy a midi only keyboard which makes no sound on its own, or like I said, a Yamaha or Casio
that has some built in voices and drum patterns. The cost isnt any more so thats why I made the suggestion.
With a midi only keyboard, you need a voice modual to create live voices. An added cost but many do buy
a midi keyboard with weighted keys then get all their voices from a midi modual or laptop. Many of the virtual instruments
you can download sound like the real deal. I have several on my computer. Something like the Native B3 sounds
just like a Hammond Organ and you wouldnt be able to tell the two appart.
There is going to be allot more work as I said building the loops in a computer.
What I did to get me going was to download some midi songs and open them up in the DAW program.
Once opened, each instrument is its own track. You can then change the tracks voicing, make a piano a guitar,
trumpet a bass, etc etc. You can also change the notes being played, add additional notes, change pitches, timing etc.
Or you can dub in your own parts with the keyboard, punch in your own lead parts, tap in your own drum breaks etc.
If you get a notation program you can even click your own notes in with a mouse. I have an old program called midisoft
I still use for that stuff. Its time consuming but is handy for touch ups. Your bigger programs like Finale, Sibelius or Notion
are what pro composers use. Stuff like movie scores are all composed on these kind of programs and synced to the film.
Its not like the old days where you still have a full orchestra recording the music to a film. Some of your bigger budget films
still have that, but for the most part you have one guy who does it all with a musical program building all those musical
sequences to fit allong with the narration in the background. Little of it is real instruments, its mostly midi instruments and samples
all composed in a notation program and imported into a DAW program where the music is cut and pasted in to fit the narration.
I use Sonar Producer for simular stuff. You can even set up two monitors and have the movie on one screen and have your daw mixer on the other.
Then you can compose music to the video. I mainly use it for live band videos. I can go in and add music tracks and remix the live recordings.
I could add midi instruments too, but like I said, most of my work is with audio tracks. I have done some stuff 100% midi. Its fun but I enjoy writing
music I can play live with a band. Building tracks with multi midi instruments would require several keyboard players to perform live.
Since its Christmas, heres a midi tune I wrote 10 years ago.
It was just an experimental orchestrational piece played to a click track that
has kind of a dark historic Christmas movie sound track sound to it.
You can hear how all the tracks were built from separate midi voices.
I then exported it from the DAW program as an audio file for CD burning and
add it to my collection of Christmas music. I make a point of recording one
Christmas tune a year, some traditional and some original. Some wind up being pretty unique.
http://dl.dropbox.com/u/1682170/2002.mp3