and down inside of it, we have one radio. the tone control, three controls down here, the set of batteries. and this one back here is the mike mixer. then we use magnets here in the corner to hold the lid on it. ♪ >> tedder always includes one other element on his guitars. it's for his muse. >> everything i do i dedicate to my wife. the blue heart is because we have been separated for 23 years now. she is still with me. she is sticking with me through this. i always put a blue heart on every letter i mail to her, every card i send to her. i put a blue heart on the case and the guitar. it's just our symbol, being separated so long. ♪