diff --git a/sys/dev/sound/midi/midi.c b/sys/dev/sound/midi/midi.c
--- a/sys/dev/sound/midi/midi.c
+++ b/sys/dev/sound/midi/midi.c
@@ -82,6 +82,7 @@
 static d_read_t midi_read;
 static d_write_t midi_write;
 static d_poll_t midi_poll;
+static d_kqfilter_t midi_kqfilter;
 
 static struct cdevsw midi_cdevsw = {
 	.d_version = D_VERSION,
@@ -91,6 +92,7 @@
 	.d_write = midi_write,
 	.d_ioctl = midi_ioctl,
 	.d_poll = midi_poll,
+	.d_kqfilter = midi_kqfilter,
 	.d_name = "midi",
 };
 
@@ -138,6 +140,9 @@
 	m->channel = alloc_unr(chn_unr);
 	m->cookie = cookie;
 
+	knlist_init_mtx(&m->rsel.si_note, &m->lock);
+	knlist_init_mtx(&m->wsel.si_note, &m->lock);
+
 	if (MPU_INIT(m, cookie))
 		goto err2;
 
@@ -172,6 +177,10 @@
 		m->wchan = 0;
 	}
 	mtx_unlock(&m->lock);
+	knlist_clear(&m->rsel.si_note, 1);
+	knlist_destroy(&m->rsel.si_note);
+	knlist_clear(&m->wsel.si_note, 1);
+	knlist_destroy(&m->wsel.si_note);
 	MPU_UNINIT(m, m->cookie);
 	destroy_dev(m->dev);
 	free_unr(dev_unr, m->unit);
@@ -216,6 +225,7 @@
 		wakeup(&m->rchan);
 		m->rchan = 0;
 	}
+	KNOTE_LOCKED(&m->rsel.si_note, 0);
 	selwakeup(&m->rsel);
 	mtx_unlock(&m->lock);
 	return used;
@@ -248,6 +258,7 @@
 			wakeup(&m->wchan);
 			m->wchan = 0;
 		}
+		KNOTE_LOCKED(&m->wsel.si_note, 0);
 		selwakeup(&m->wsel);
 	}
 	mtx_unlock(&m->lock);
@@ -516,6 +527,65 @@
 	return (revents);
 }
 
+static void
+midi_kqdetach(struct knote *kn)
+{
+	struct snd_midi *m = kn->kn_hook;
+	if (kn->kn_filter == EVFILT_READ)
+		knlist_remove(&m->rsel.si_note, kn, 0);
+	else if (kn->kn_filter == EVFILT_WRITE)
+		knlist_remove(&m->wsel.si_note, kn, 0);
+}
+
+static int
+midi_kqfilter_event(struct knote *kn, long hint)
+{
+	struct snd_midi *m = kn->kn_hook;
+	if (/* there's something wrong */ false) {
+		kn->kn_data = EBADF;
+		kn->kn_flags |= EV_ERROR;
+		return (1);
+	}
+	switch (kn->kn_filter) {
+	case EVFILT_READ:
+		kn->kn_data = MIDIQ_AVAIL(m->inq);
+		break;
+	case EVFILT_WRITE:
+		kn->kn_data = MIDIQ_AVAIL(m->outq);
+		break;
+	}
+	return (1);
+}
+
+static const struct filterops midi_kqfilter_ops = {
+	.f_isfd = 1,
+	.f_detach = midi_kqdetach,
+	.f_event = midi_kqfilter_event,
+};
+
+static int
+midi_kqfilter(struct cdev *dev, struct knote *kn)
+{
+	int error = 0;
+	struct snd_midi *m = dev->si_drv1;
+
+	kn->kn_hook = m;
+	kn->kn_fop = &midi_kqfilter_ops;
+
+	switch (kn->kn_filter) {
+	case EVFILT_READ:
+		knlist_add(&m->rsel.si_note, kn, 1);
+		break;
+	case EVFILT_WRITE:
+		knlist_add(&m->wsel.si_note, kn, 1);
+		break;
+	default:
+		error = EINVAL;
+		break;
+	}
+	return (error);
+}
+
 static void
 midi_sysinit(void *data __unused)
 {