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Brighton Bandstand, the Birdcage sitting on the city seafront, designed by Phillip Lockwood and completed in 1884 is designated as a Grade II Listed Building of Architectural importance.

Bandstands were hugely popular throughout Victorian Britain and Brighton & Hove originally boasted to having eight strewn across the two towns.

The Brighton Bandstand and its use as a performance venue lasted up until the mid sixties and bands still actually performed on it up to that point, but it was wastefully not utilised until the early part of the 21st Century.
Link

The bandstand was re-opened in July 2009 after work costing £850,000 Link

Listed buildings and structures are officially designated as being of special architectural, historical or cultural significance. There are over half a million listed structures in the United Kingdom, covered by around 375,000 listings.
Listed status is more commonly associated with buildings or groups of buildings, however it can cover many other structures, including bridges, headstones, steps, ponds, monuments, walls, phone boxes, wrecks, parks, and heritage sites, and in more recent times a road crossing (Abbey Road) and graffiti art (Banksy 'Spy-booth') have been included.

In England and Wales there are three main listing designations;
Grade I (2.5%) - exceptional interest, sometimes considered to be internationally important.
Grade II* (5.5%) - particularly important buildings of more than special interest.
Grade II (92%) - nationally important and of special interest.

There are also locally listed structures (at the discretion of local authorities) using A, B and C designations.

In Scotland three classifications are also used but the criteria are different. There are around 47,500 Listed buildings.
Category A (8%)- generally equivalent to Grade I and II* in England and Wales
Category B (51%)- this appears generally to cover the ground of Grade II, recognising national importance.
Category C (41%)- buildings of local importance, probably with some overlap with English Grade II.

In Northern Ireland the criteria are similar to Scotland, but the classifications are:
Grade A (2.3%)
Grade B+ (4.7%)
Grade B (93%)

Read more at Wikipedia Link

A bandstand is a circular or semicircular structure set in a park, garden, pier, or indoor space, designed to accommodate musical bands performing concerts. A simple construction, it both creates an ornamental focal point and also serves acoustic requirements while providing shelter for the changeable weather, if outdoors.
Many bandstands in the United Kingdom originated in the Victorian era as the British brass band movement gained popularity. Smaller bandstands are often not much more than gazebos.