Yes, grape hyacinth is its common name.  It looks fab planted as a river flowing thru other bulbs at Keukenhof but can be an invasive nightmare in smaller hardens.
No need for me to repeat the name, but I think they're evil! The flower is quite pretty, and I seem to remember it being a 'novelty' many years ago - maybe it wasn't so common then. But it spreads like mad - I assume partly by seed, and by offset bulbs. The lank floppy foliage seems to be present for half the year. I've taken to grasping handfuls of them, and with luck (depending on type of ground, and how wet) the whole lot comes up, bulbs and all (and straight into the green bin). I've largely done the rounds of removing them for this year, but each day, another evil little blue flower has popped up somewhere.
Looks like you (or something) has already been removing most of the leaves - they'd normally be about a foot long, and flopped everywhere.
Some packs of 'mixed bulbs' bulk up the numbers with the awful Allium moly, and others with these things. Last year, someone gave me mixed Daffodil / Tulip / Fritillaria (lovely), and guess what made up the rest. I planted the first 3 (and gave the Muscari to someone else).
Not keen on muscari myself as they are very invasive here and spend most of the year looking like rather untidy grass, as their leaves never seem to die back. I do have a few in pots though, which just get put somewhere out of sight for most of the year.
A trowel in the hand is worth a thousand lost under a bush.
My daughter gave me a Mothering Sunday planted basket about 10 years ago, I put the plants in a front border (thankfully surrounded by edging), primroses, muscari, narcissus, a lovely hyacinth, but all that remains is a very large patch of the muscari
"The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it."Â Sir Terry Pratchett
I like them but have them mainly in pots. I suppose it's like a lot of things you need to give them time. I divide mine every other year and never let them go to seed.
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I don't even "leave them for the flowers" any more. I rip them off as soon as I see them.
I've planted some here. There's a lot of space, though, so it'll probably be a few years before I'm cursing them... Â