I don't think I can easily support adding additional symbols. The text entry is all provided by whatever keyboard you have installed on your device. Whatever emojis are available is determined by that keyboard. The way those emojis are displayed is completely dependent upon the OS (I'm not sure how they are going to show up on the Windows 10 version, for example). You could go look for a different keyboard to install off Google Play that may provide additional emojis.
If it's all based upon unicode symbols, then you should be able to see what's available by looking at lists like this one: http://www.fileformat.info/info/unicode/...s/list.htm
I saw the palm tree in that list, but no banjo. You are probably going to be limited by what unicode supports. I even looked through this larger list and only found the following symbols related to instruments: http://www.fileformat.info/info/unicode/...o/list.htm
U+1F3B5 MUSICAL NOTE ? view
U+1F3B6 MULTIPLE MUSICAL NOTES ? view
U+1F3B7 SAXOPHONE ? view
U+1F3B8 GUITAR ? view
U+1F3B9 MUSICAL KEYBOARD ? view
U+1F3BA TRUMPET ? view
U+1F3BB VIOLIN ? view
U+1F3BC MUSICAL SCORE ? view
If it's all based upon unicode symbols, then you should be able to see what's available by looking at lists like this one: http://www.fileformat.info/info/unicode/...s/list.htm
I saw the palm tree in that list, but no banjo. You are probably going to be limited by what unicode supports. I even looked through this larger list and only found the following symbols related to instruments: http://www.fileformat.info/info/unicode/...o/list.htm
U+1F3B5 MUSICAL NOTE ? view
U+1F3B6 MULTIPLE MUSICAL NOTES ? view
U+1F3B7 SAXOPHONE ? view
U+1F3B8 GUITAR ? view
U+1F3B9 MUSICAL KEYBOARD ? view
U+1F3BA TRUMPET ? view
U+1F3BB VIOLIN ? view
U+1F3BC MUSICAL SCORE ? view