The first album, Backstreet Symphony, is probably their best, just classic rock track after rock track, no album fillers here. Everything great about British rock, has elements of Free, Rolling Stones, Bad Company. What makes them a great band is Luke Morley, Lead Guitar, is also their song writer and he's brilliant. Danny's vocals are arguably some of the best in the business, Harry is a brilliant drummer and Ben on keyboards and rhythm guitar adds that extra layer and fills out the sound with piano / keyboards.
That's not say their follow up albums aren't up to mustard. They continue this great sound and grow musically.
The have a habit of doing cover versions of rock classics that make the original just seem a little dull in comparison.
Gimme Some Lovin