May 25, 2021 Halsey, Khalid and Benny Blanco might be able to do anything if they put their minds to it -- and one band claims the hitmakers were set on ripping off a song 3 years ago. Konstantine Lois and Shane Williams say they wrote a song called 'Loveless' in 2015 for Williams' musical group American XO. Now, they've just sued the above-mentioned A-listers ... claiming their 2018 smash hit, "Eastside," is basically a carbon copy of their own tune. In the docs, obtained by TMZ, Lois and Williams are suing for copyright infringement and are going after not only Halsey, Khalid and Blanco -- but also Ed Sheeran, who's credited as a songwriter on "Eastside," plus the labels who distributed it. They say the similarities are fairly obvious ... to their ears, at least.