[steveg]

I would generally recommend using a semi-colon instead of a comma for the delimiter, as that will ensure if you have any values that have a comma in them that it won't mess up the parsing. I'll need to see the file you imported in order to provide information on why it didn't work. There isn't enough information for me to say with any certainty, as I don't know what the lines looked like that followed the first.

As far as deleting, just enter "Interlude" in the search box, which should limit all the songs to only those containing Interlude in the title or one of the fields (and the dropdown can be used to limit it to the title or a specific field if needed), then long press to select one, tap the select all icon at the bottom right in the floating toolbar, and then tap "Delete".

Mike

Here are a few lines....
title,pages,key,composer,collection
Interlude 1,1,C,Murray,Murray - Liturgical Interludes
Interlude 2,2,C#m,Murray,Murray - Liturgical Interludes
Interlude 3,3,D,Murray,Murray - Liturgical Interludes

There are no commas other than the delimiters. 
It has not imported the key, composer or the collection. The titles are there and bring up the correct pages.
Thanks
Steve