I considered that that may be your requirement, but I thought there were too many unknowns for me to sensibly implement sample code. The most important is what should happen where the last tag seen may be associated with multiple concordance fragments? I chose to only consider tags within the current fragment. Another option would be to reuse a tag for all following fragments until a new tag is found, or a tag could be associated with the first following fragment, or the first following fragment so long as it is within some maximum distance of the tag.

I would first split the text by tag entries, then perform the concordance match on each fragment:

use strict;
use warnings;
use Lingua::Concordance;

my $text = <<TEXT;
Oldfield's career began fairly early, playing <1> acoustic guitar in l
+ocal folk
clubs. At this time, he already had two fifteen-minute instrumental pi
+eces in
which he would "go through all <2>sorts of moods", precursors to his l
+andmark
1970s' compositions. In his early teens, Oldfield was involved in a 'b
+eat group'
<3>playing Shadows-style music (he has often cited Hank Marvin as a ma
+jor
influence, and would later cover The Shadows' song "Wonderful Land").
TEXT

my $concordance = Lingua::Concordance->new();

$concordance->text($text);

my @parts = split /\s*(<\d+>)\s*/, $concordance->text();
my @frags;

unshift @parts, '' if $parts[0] !~ /^<\d+>$/;

push @frags, map {$_->[0] =~ s/[<>]//; $_} [splice @parts, 0, 2] while
+ @parts;

$concordance->query('in');

for my $fragment (@frags) {
    my ($tag, $fragText) = @$fragment;

    $concordance->text($fragText);
    print "$tag: $_\n" for $concordance->lines();
}
[download]

Prints:

: fairly early, playing                   
1>:   acoustic guitar in local folk clubs. A
1>:  had two fifteen-minute instrumental pie
1>: wo fifteen-minute instrumental pieces in
1>: strumental pieces in which he would "go 
2>: 0s' compositions. In his early teens, Ol
2>: ens, Oldfield was involved in a 'beat gr
2>: ield was involved in a 'beat group'     
3>:               playing Shadows-style musi
3>: en cited Hank Marvin as a major influenc
3>: Marvin as a major influence, and would l
[download]

It should be fairly trivial to modify the loop to meet whatever additional constraints you require.

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