Are you a guitar player?<br><br>If yes, but in your case maybe even if not, here&#39;s my 2p:<br><br>TuxGuitar 
has an extremely easy way of inputing notes using the numeric keyboard
as tablature (string/fret), or just point and click notes.<br>
<br>Chords names and/or fretboards are a shortcut away<br><br>It outputs staff, tab or both in pdf or LilyPond<br><font color="#888888"><br>VM</font>