Few events in Belfast are likely to be as emotionally charged as this evening’s tribute to Sparklehorse. Anyone familiar with the band’s output -and it immediately transpires that not one soul in tonight’s intimate gathering does not hold every beat, note and lyric in their hearts – will already know that frontman Mark Linkous took his own life seven years ago. That fact, tragically, is unavoidable, and there is certainly no avoiding the spectral shadow that such an unnecessary and painful loss casts over the entirety of Linkous’ back catalogue. It is impossible to listen to his music without feeling…