Technical issues are part and parcel of every tour, especially mammoth treks like Taylor Swift's Eras tour. Yesterday in Warsaw, Poland, Swift was about to start strumming her next song on her ...

Eagle-eyed fans noticed that the guitar is actually a limited edition Koi Living Jewels Acoustic Guitar by Taylor Guitars, which Swift famously played each night during her Speak Now tour.

That's fairly new considering some of its competitors, like Gibson or Martin Guitars. Today, big music names like Taylor Swift, Jason Mraz, and Zac Brown strum to the tune of a Taylor guitar.