If you love playing music, you’ll love the Roland BTM-1 Bluetooth Speaker with Instrument Input. This speaker plays high-quality music, but it also allows you to play along. As it is a speaker with a guitar input, you can plug in your guitar and use the device as an amp. Plus, you can stream music from your smartphone to this Bluetooth speaker with an instrument input. Not only that, but the music can play while you use your instrument. So..