List<Future<ProjectSegment>> futures = new ArrayList<>();
        for (ProjectSegment projectBuild : projectBuildList) {
            final Future<ProjectSegment> buildFuture =
                    service.submit(new Outputter(threadOutputMuxer, projectBuild, lyrics.next()));
            futures.add(buildFuture);
        }

        for (Future<ProjectSegment> future : futures) {
            future.get();
        }