Dashing and Dancing

A graphic, entertaining and amusing concert piece; definitely not one to be marched-to!

This was probably Wiren's most famous work, though he wrote plenty more including symphonies and film-scores. Do not confuse this march (in the same key) with the 'Dr. Findlay' signature tune by 'Trevor Duncan' (real name: Leonard Trebilco, but who needed a pseudonym for his musical submissions to the BBC ~ since his 'day-job' contract as a sound engineer expressly forbade him to have any concurrent artistic involvement with the Corporation)

These are all generally well-known classical dances, apart from No.1 which fairly obviously would be a march. The alternative title could refer to 'toy' marches by Leon Jessel or Gabriel Pierné

Of the 'distractors', the Tango (Answer 1) apparently originated in the bordellos of Buenos Aires (roughly at the same time as Ragtime developed in similar surroundings in New Orleans); the Siciliana is a gentle, lilting Baroque dance from Italy (as its name suggests) while the Saltarello is a more northerly Italian peasant dance in quick jig time.
Gilbert's lyrics inherently call for the castanets, and Sullivan's music offers stimulating scope for any show choreographer!

The emblem was a double-headed eagle, and the deeply characteristic but attractive march can easily be accessed by title on YouTube and elsewhere. (Its original German title is Unter dem Doppeladler.)
This Quiz is being drafted in the weeks prior to the Great War centenary, so all the 'distractors' in this Question are resolutely British, however pompous or jingoistic their titles may seem. Answers 1 and 4 are by William Walton, and No. 3 by Edward Elgar. If you can cope with more than one march at a sitting, each of them would well repay a hearing

Each of the upper three Answers is a dance in (usually) middling 3-in-a-bar time, though there are also fast waltzes and the syncopated jazz-waltz; the Laendler is a Tyrolean country dance which may well have been its precursor. The Polka is emphatically a two-step

Appropriately or otherwise, his surname, correctly pronounced in Spanish, sounds not unlike the English word 'fire' (which in Spanish, of course, is fuego).
Meanwhile Tarrega was dead by 1909, though not before having written a Gran Vals for guitar, a fragment of which was 'nicked' by Nokia for its classic mobile phone ringtone (the one that people still imitate as the archetypical irritating interruptor ~ not least of classical music concerts!) ~ try 15 seconds into this clip, if still available, or any other equivalent : Tarrega Gran Vals (Accessed 25 June 2014)

The Nocturne is a serenade rather than a dance, and Chopin's development of the style (originated by the Irishman John Field, incidentally) makes frequent expressive use of rubato ('pulling the time around'), making coordination difficult if the pianist were accompanying a dancer. The ballet suite based on Chopin piano music, Les Sylphides, does indeed include at least one Nocturne, and its most widely used orchestration is by Roy Douglas, from 1936 (whom we slipped in at Q.2 A.3 above, and at time of writing is still alive at the aged of 106-and-a-half!)

In its original form this is rather more widely known as 'the Can-Can' (this being the style of dance performed to it)

The title is itself a neologism, but Answer 2 seems the most comprehensive and likely. For further on this please refer to Wikipedia