#136 Here is a line drawing of a popular steel guitar headstock with 8 strings:
http://www.tribotone.com/img/steel_guitar1.jpgHere is another popular headstock with 10 string configuration:
http://www.tribotone.co/img/steel_guitar2.jpgHere is an actual photograph of a ten string:
http://www.tribotone.com/img/Steel_guitar3.jpgWhat I was thinking was to continue on the right side of the icon with the same width of the two swooping lines with a solid white bar and ending with a very simplistic steel guitar headstock shape. Just as simple but beautiful as the guitar above it. So that it's not too forceful the bar (or neck) of the steel guitar could have 1 or 2 black fret lines or fret markers (a dot) to fully get the picture of this type of guitar. Anything that resembles the headstock will work. Players will know what it is even if it's as artistic as the guitar in the logo. Also add TM. Hope this helps and makes sense:-)
Eric