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Looking for some unusual items to make Father’s Day or Graduation Day memorable? These gifts go with dads and grads (not to mention bridegrooms) who have almost everything. While each is cool on its own, the gifts below add new fun to stuff your special someone already owns.

IF they have a MIDI-enabled piano, synthesizer or other keyboard and nobody to jam with: A one-month subscription to eJamming ($19.95; www.ejamming.com). The musician on your list can go to eJamming and play along with anybody else on the site at the same time. This new site has fewer than 50 members right now, but there are weekly jams to take part in. Guitar players, bass players and drummers also are welcome, but they’ll need special equipment and a crash course in computer-aided music. Keyboard players know a little bit more about this. A big caution: Monthly memberships renew automatically, so make sure you cancel; if the musician in your life likes eJamming, he can sign up with his own credit card.

IF they have a passion for golf, as well as a PlayStation 2 or an Xbox: “Real World Golf” ($69.99; www.madcatzstore.com). Dad can connect this game to his PlayStation 2, Xbox to play 18 holes day or night. “Real World Golf” comes with special gloves that follow Dad’s golf swing and moves the on-screen golfer. He can use the included plastic golf club or his own clubs; he can adjust his stance, swing speed and club choice; even course difficulty.

If they have an iPod and a need for speed: Dodge Magnum remote-controlled car ($99; www.walmart.com, www.dodge.com). The car’s underside has a compartment for an iPod. Plug it in and blast your tunes while you cruise your driveway. The car has engine sounds, a horn, under-car blue lights and three speeds. What it doesn’t have is a speaker with lots of bass, so if your special someone has an iPod loaded with classic rock, he’s in for a treat.

If they have CDs, DVDs or video games that need protecting: D(underscore)Skin ($19.99 for a 20-pack; www.d-skin.com): Slip one of these clear disks over the shiny side of your CD or DVD to keep your discs scuff-free. The D(underscore)Skin stays on when you slide your CD or DVD into the player. A cheap way to protect your CD, DVD and video game collections.

If they have a computer and a hankering to learn guitar: Fretlight ($500; www.fretlight.com).

The Fretlight looks like a regular Stratocaster-style guitar, but it has one difference: Its polymer fretboard lights up to show you where to place your fingers to play chords and scales. This method of learning guitar is more immediate than watching a DVD or reading a how-to book. The guitar hooks up to a computer, and software lights up the fretboard, Simon Says-style. The alder-body guitar features nice machine heads and other signs of craftsmanship, so your guitar hero won’t outgrow the Fretlight after it teaches him how to play.

If they have an XM satellite radio subscription: Pioneer Inno (left, $399; www.xmradio.com, www.pioneerelectronics.com) The Inno doesn’t just play XM’s 100-plus stations; it records them, too, so you have something to listen to when you’re out of satellite range. Tell the radio your favorite songs, and it will record those songs whenever any of the stations plays it. Unfortunately, the beginnings of songs are cut off, or you might record a deejay talking as a song begins. To get the full version of the song, tell the radio that you want to buy those songs, then connect it to a computer, and it will download those tunes from www.napster.com for 99 cents (after a Napster account has been set up). The Inno also accepts MP3s you’ve created from your CD collection. Caveat: The music industry is suing XM over its radios’ recording abilities, but the Inno is on sale, and similar XM radios are coming, such as the Samsung Helix (above, right; $400; www.xmradio.com).

If their home has a wireless network: Skype Wi-Fi Phone (available June 30 for $250; preorder at www.netgear.com). Millions of computer users around the world use Skype software to make free Internet phone calls to other Skype users. They pay pennies a minute to call ordinary phones, too, but they have to be near their Internet-connected computer. The Skype Wi-Fi phone connects to a wireless Internet connection in a home or at coffeehouses and other places that call themselves Wi-Fi hot spots. That means the phone can make calls without being near a computer. A couple of caveats: The phone shouldn’t be used to make emergency calls (rescuers won’t be able to pinpoint where you’re calling from, as they would with today’s GPS-enabled cell phones), and the phone won’t be available until later this month.